The Goodfellas Scene
Personally I loved the scene where DeNiro's character goes to watch a movie and they end up playing Goodfellas. I'm not quite sure why people have an issue with it, it was a small joke. There's also another scene in the movie earlier where DeNiro's character talks about Al Capone while he's holding a bat. A brilliant reference to his Capone character with the bat in The Untouchables.
It's not the greatest movie ever made, but it was decent and pretty funny.