Again, Manchester City didn't look overawed by playing Barcelona, but Nick Miller writes that Wednesday night showed how far they have to go to truly compete with them...
Arsenal should be embarrassed by the admin error that led to Arsene Wenger naming only six subs against Bayern Munich. But this sort of thing happens all the time in football...
* Before we begin, can we finally put the terms El Cashico and El Plastico to bed? And when they've been put in bed, suffocate them with pillows? Good, glad that's agreed.
* If this was billed as the battle of the two title favourites and two managers with recent rivalry, then it is Chelsea that must now be considered in pole position to surge on, and Jose Mourinho who won the tactical fight.
In the first half, City's lone striker approach simply played into Chelsea's hands. Mourinho has preferred his side to operate on the counter attack this season - on Tuesday in Gelsenkirchen Chelsea won 3-0 despite having 40% of the ball and just four shots on target - and during the first half a carbon copy situation appeared as the home side simply soaked up City having more possession (58%) without any great concern (two shots on target, neither requiring difficult saves). Furthermore, they then countered to go in ahead at the break.
Pellegrini's side established themselves with greater success during the second period, but Chelsea would have considered themselves unlucky to have not won had it not been for City's late cock up.
* So, who is to blame when a goalkeeper and defender rush towards each other? The answer perhaps lies in the question of communication, but both Joe Hart and Matija Nastasic must take the blame.
As a defender (particularly in the dying embers of a match) surely the better option is to clear the ball long over your head rather than back towards your own goal? And, as a goalkeeper, you have to be 100% sure that your team mate knows that you are advancing out of your goal, or you risk ending up with egg on your face.
Such are Joe Hart's current woes that it will undoubtedly be he that receives the most slow motion investigation, but the conclusion must be that at crunch times, disaster has to be avoided if a side is to win a title.
* The concerns pre-match were that both Manuel Pellegrini and Jose Mourinho may be content with a tight, tense affair. With one of the three pre-season contenders so unexpectedly far off the pace, any match between the two title favourites could be forgiven for, at least initially, being operated as a 'must not lose' mentality.
Evidence too could be found in the corresponding fixture during the last campaign, a drab, turgid, goalless affair made notable only for it being Rafa Benitez's first game in charge at Chelsea, together with the stationery paraphernalia required to commemorate such an occasion on the part of a moronic element of the home crowd. It was possibly the worst spectacle of any televised game last season.
* A mentality of conservatism over adventure could have been excused further on City's part given the absence of captain Vincent Kompany. That was certainly the opinion of Eden Hazard before the game, singling out his Belgian team mate's fitness as the crucial factor in the match. "Kompany is really important for City because when he plays they win and when he doesn't play they lose, often. I prefer to play with players like that than against them."
Quite why a club that has spent £670m in five years should be so reliant on one central defender is alarming, but that's a different matter.
* There's conservatism and there's a lack of ambition, and a failure to pick Negredo and Aguero strikes me as the latter. Of the four games the pair started together before Sunday, City had won all four by a combined score of 12-4, and the two forwards had registered eight goals and five assists between them in that time.
The understanding between the pair is particularly startling given the brevity of their working relationship. Despite, being the greater physical presence, Negredo actually plays in a support role, with Aguero operating on the last shoulder of the defender. The Spaniard is the target for longer balls, and uses his aerial presence to flick the ball on to Aguero, then often drifting wide to receive the ball back from the Argentinean.
Even when Negredo was introduced, it was to replace his usual partner rather than join him.
* More importantly, withdrawing support for his Argentinean striker simply lowers the impact that Aguero can have. Coming into the game, Aguero was on a frankly ridiculous run of eight goals in six games, including braces against Manchester United, CSKA and West Ham. All of this has been achieved with a strike partner.
Aguero's determination and perseverance was wonderful at times, and he was rightly lauded by level after the game. It just left me wondering how good City could have been if he had been assisted appropriately. In fact, it was the first time all season that City had played with a lone striker. That's a hell of a gamble in a match against title rivals.
* And yet, despite all that, Aguero came good in a flash. Good strikers finish chances, that much is clear. Great strikers finish half chances. And the best in the world finish quarter chances.
Aguero's strike two minutes after half-time falls under that bracket, the sound of shocked silence deafening as the home side grasped how early (and how cleanly) the forward had taken the chance.
"He [Aguero] is a top player," Pellegrini said in his press conference before the game. "I always talk with Sergio about the fact that he is, for me, one of the top five players in the world." Rather difficult to argue with that sentiment, old chap.
* He might be the only sportsman to have had more comebacks than Rocky, but the strange decision to loan out Romelu Lukaku certainly afforded Fernando Torres once last drink in the last chance saloon. After the victory at Schalke on Tuesday, some fell for the schtick that maybe, just maybe, the Spaniard could regain some confidence and composure.
Well you know what, I've sort of fallen for it too.
Of course there was the customary miss from 15 yards when completely unmarked, but from then on a real sharpness was evident. Gael Clichy is no slouch but Torres ghosted past the Frenchman to provide for Andre Schurrle, and his shot against the post was a simply phenomenal strike. The late winner was just rewards for his endeavour.
Across the whole match, no player tried to take on a man more times than the Spaniard, surely the sign of added belief. I can't remember the last time he played so well in a big ga... scratch that, a league ga... scratch that, any game.
"Would the old Torres have let his head drop there?" asked Ed Chamberlin at half-time. Which does rather raise the question of just how many bloody Torres' there are.
* Niall Quinn, speaking after the match, claimed that Torres would not be back to his best until he was scoring "two or three a game".
Don't rest on your laurels Nando, because no-one has ever achieved that rate.
* Both Martin Tyler and Gary Neville repeatedly criticised Petr Cech for not saving Aguero's hit, but that just emphasises two things.
Firstly it shows the absurdity of non-goalkeepers passing comment on the role, whilst it was also pure justification for the principle that if you shoot before the keeper has set himself, there is a much better chance of the ball getting past him.
* Nick Miller wrote this week about how the return of Jose Mourinho had given John Terry a new lease of life, and his performance against City demonstrated as such. No player on the field made more tackles or interceptions than Chelsea's captain, and he didn't lose an aerial challenge all game.
There are still decisions to be made as to whether David Luiz or Gary Cahill is the best option at the back, but at 32 Terry remains a permanent fixture.
* What has Joleon Lescott done to someone of authority at Eastlands (our lawyers don't want you to answer that)?
Pellegrini admitted before the game that Martin Demichelis was not fully match fit, and yet was given his debut in English football on such a high stage. An experienced player yes, but still a huge task for the Argentine, who lost Schurrle for Chelsea's first goal, and on more than one occasion struggled to maintain he defensive line.
Lescott has his limitations, that much is clear, but if he is genuinely considered as a lesser option that both Javi Garcia and Demichelis then something has gone fundamentally awry - this is a centre back who started 30 games in City's title-winning season.
* At least Pellegrini did finally select a central defender in central defence. Javi Garcia has looked flaky and uneasy (at best) in the role and was pushed into midfield.
It reminded me of an anecdote about Brian Clough, who had selected at 18-year-old youth team left back for the first team when both first and second choices for the position had been injured. When asked why he not opted for a more experienced centre half or left sided midfielder, Clough abruptly responded that a player trains for ten years to play in a certain position. If he isn't good enough to deputise in that role in the inevitable case of injury or suspension, he shouldn't be at the club.
Whether Demichelis is the long-term answer (he clearly isn't) is another matter, but at least this was round pegs in round holes.
* Andre Schurrle had not impressed entirely following his move from Bayer Leverkusen, but was rather brilliant on Sunday. He completed every pass during a first half in which he barely put a foot wrong.
But forget the statistics for a minute, because the German's movement for his goal was pure poetry. Feint to the back post, feint to the front post, leave the defender, finish the chance. Sometimes football should always be that simple.
Schurrle could perhaps feel slightly unfortunate to be removed with 25 minutes remaining, but such is life when Willian sits on the bench.
* One which note, nothing underlines the financial muscle of both sides more than a quick glimpse at the benches during the first half. Willian, Edin Dzeko, Juan Mata, Jesus Navas, David Luiz, Alvaro Negredo and Samuel Eto'o. Sheesh.
Daniel Storey - he's on the Twitter.