Character mistake: When Billy is telling Diana about Sophie and who she chose, Diana asks if Paddy knew about that and Billy says no. Only problem is that earlier, Paddy told Diana that Sophie picked him, showing that he didn't know the truth, so Diana should've known that already.
Last Vegas (2013)
1 character mistake - chronological order
Directed by: Jon Turteltaub
Starring: Robert De Niro, Morgan Freeman, Michael Douglas, Kevin Kline
Genres: Comedy
Revealing mistake: Early on when the guys are going to New York to pick up Robert De Niro there's an aerial shot of New York/Manhattan. In it you'll see the helicopter's shadow on the Brooklyn Bridge, and it is traveling in reverse. Also the flag on the top of the bridge is not flying properly.