Factual error: In the scene where they are heading towards the Aria hotel to check for hotel rooms, they walk past the volcano at the Mirage. They are walking in the opposite direction (away from) the Aria hotel.
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.
Continuity mistake: In the scene where Sam takes the girl to the hotel room villa, you can see his tie/scarf goes from being on both shoulders, to one shoulder, then back to both.
Continuity mistake: When Sam is in the rental car the door is locked then unlocked and locked again. (00:17:00 - 00:17:40)
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.
Continuity mistake: When Dean comes to apologize to the guys and Paddy tells him who they are, just before he says Archie's name, you can see his hands down but when it comes to a close up, his hands are up and when Paddy says Sam's name, you can see Archie raise his hands up again.
Continuity mistake: In the scene at the guy's party when Diana shows up, we see her greet and hug someone, but in the next shot of Paddy and Billy we can see Diana in the background and that person is completely gone.
Continuity mistake: When going to hotel room with the young girl, the guy takes his tie off and hangs it outside the door. Then it reappears when she's helping him take his jacket off.
Continuity mistake: Sam's scarf in the scene where he almost had sex with that one girl changes from a scarf to a tie that's supposed to be on the outside of the door.
