Vince closes and hides the blue box containing all his cocaine paraphernalia when Amy knocks on the door. However when she then calls the police, in his mad rush to exit, he once again closes and puts the blue box in his bag.
When Jon enters the hotel room the door appears only just ajar behind him, when we return to Jon from a shot of Vince the door is wide open, the next shot it is back to its original position.
Vince changes positions in bed during the "why are you lecturing me" dialogue.
Early in the movie, Vince is drinking in front of the bathroom mirror, and a camera and cameraman are reflected in the mirror.