Continuity mistake: When Nick is singing "Spend This Night with Me", he brings up a girl from the audience. Watch the background. When it shows another girl from the audience, in the next shot, you can see a speaker that wasn't there before. Moreover, when he picks the girl, we can see that there isn't anyone at her left side. But a few seconds earlier she was sitting between two girls (the one at her left was wearing a white shirt).
Revealing mistake: When Chocolate Mousse throws the anchor with the rope attached into the air, if you watch the ground when they run away, you can see that there's suddenly a lot more rope there, revealing that it was filmed in two takes and the anchor wasn't really thrown directly above their heads.
Visible crew/equipment: In the "Straighten the Rug" dance scene, when Nick runs up the wall and does a backflip, it is clear that he is being held up by wires. The filmmakers did a good job rotoscoping the wires out against the wall, but when his legs pass behind the wires and harness, they have not been taken out at all and are visible. (Freeze-frame when he is completely upside down for the best view.).
Continuity mistake: During the truck fight, we see Nick holding himself with the right hand on the truck. He reaches out with the left one (on which he then wears a ring) and then we see his hand switching the radio buttons. But this time it's his right hand, and happens to wear the ring again. After that, he pulls Nigel from the seat with the left arm (and the ring is gone again).
Continuity mistake: When Nick is first arrested, he is placed in a cell in which we see a blender with some accessories on a shelf and a ripped off picture of Cher on the wall. The blender remains there when he is taken to be tortured, but the photo of Cher is gone. After he is tortured, is thrown back in the cell but the blender, its accessories and the picture are gone. Seconds later, he stands up searching for a way to escape and we see the ripped off photo is back in place. As he enters through the ventilation duct, we see the photo falling down and leaning upside down against the wall.
Continuity mistake: Before assaulting the German prison, Chocolate Mousse asks Deja Vu how much time they have until the power is cut. Deja Vu says "three more minutes" as his watch marks 7:22. In the next shot, as he moves his hand with the extra-large watch back down, the watch is roughly at 7:17.