When Rodrigo "Bolas de Madera" is talking to the receptionist, the camera cuts to her in the middle of one of his sentences (right before she asks him how blonde does he want to go). In that shot, Rodrigo's mouth isn't moving at all.
In the coffee shop, after Deuce comes out of his trance, he is biting on TJ's chest. TJ then yells at Deuce to stop, and the camera goes to TJ's back, but while he is talking his mouth is clearly not moving.
At the end of the movie when Lily sprays Gaspar with beer and the scene cuts back to the crowd, she can be seen cheering at the bottom left. Then when Svetlana trips and her nose goes into Lily's throat, she can be seen again in the crowd gasping.
While the group of man-whores are leaving the stage at the final awards ceremony, you can see over Deuce's shoulder that the stage is emptied of all but one or two characters. In the next wide-shot immediately following, the stage is once again full, and everyone again starts to run off of the stage.
During T.J.s "jail time" the character with the eye-patch listening to his speech appears with the eye-patch in his left eye, however the next time the camera focuses on him the patch is in the right eye.
In the airplane to Amsterdam, while Deuce is walking to his seat with Kate's leg, it wobbles too much. this is impossible, because a prosthesis cannot be made with such material that holds a human weight and wobbles like shown in the film.
When Deuce and Gaspar are fighting at the Gigolo awards, the swords they are both using have a lot of visible protuberances, which cannot be found in any kind of metals that make swords, only in plastics. the fact of it coming from a statue could possibly mean that they are not made of metal, but the sounds made by the swords during the fight reveal that it is a metal the sword is made from.