The Shrews opener was a 30-yard free-kick by Matt Richards which completely deceived Gillespie as it dropped over his head and into the back of the net.
The keeper, who was returning after a one-match ban, then failed to gather a ball at his near post which allowed Yado Mambo to squeeze an effort in.
"He will be playing at Sheffield United on Monday," said Abbott, who saw Lee Miller score two penalties for his side to earn a 2-2 draw.
"He will be a really good keeper. He has made two errors, it's as simple as that, but he made two superb saves after that. He is a baby in football terms.
"There's a lot of tension around and we were good, bad and indifferent. The players are giving everything they have got and fighting for the fans.
"We have a lot of kids and they are learning all the time."