Deliberate mistake: When Austin and Felicity cross the street when they are shopping, you can see green hills behind them, very much like Hollywood and not 1969 London. (Deliberate reference to an earlier joke)
Deliberate mistake: When Jojima's car is blown into the air, one of Ryuuichi's thugs throws a knife at it. When Jojima gets out after the car crashes to the ground, the knife is stuck in his stomach. This is physically impossible, as the knife would have to go through a large portion of metal to hit him there.
Deliberate mistake: When Dooley looks at the photo of himself, Jerry Lee and his wife Tracey, it's obviously a still shot from the first movie, as the angle the picture is taken from was obviously not taken by anyone else as they were the only two in the apartment with Jerry Lee at the time. (01:11:40)
Deliberate mistake: At about 1 hour 24 minutes, when Tom Sizemore is looking in the mirror, his injured lip goes from original right side to left side.