The Whites withstood a fierce fightback from their West London rivals to push them closer to Premier League relegation.
Dimitar Berbatov's double and an own goal put the hosts 3-0 up in the first half but QPR, adrift in the bottom three, stormed back and the home team were forced to cling on after midfielder Steve Sidwell was sent off 11 minutes from time.
"It was a great game for the spectators," the Dutchman told Sky Sports.
"Overall it was a bit disappointing at 3-0 up and then you make it difficult for yourself.
"The Sidwell sending off I thought was a bit harsh, that was difficult for us. It was a bit unfortunate."
Fulham are virtually guaranteed top-flight football next season and Jol is looking up the table, not down.
"Hopefully 39 will be enough, but it is tough you can still go down," he said.
"Hopefully we can go a bit higher, but first we will celebrate the three points."