Visible crew/equipment: When the Pest is trying to hustle the crowd as a blind man, there is a Hispanic kid in the background watching. He starts making faces and throwing up hand symbols at the camera. He was either a kid who sneaked onto the set or an extra who decided to get noticed.
Other mistake: Before Pest is getting hunted, the hunter makes a toast, there are two mistakes here, one is that the champagne glasses fluctuate the amount that is in them, and in a couple cut scenes you'll see that it is raining, and in others it isn't.
Factual error: When the Pest is in his girlfriend's house, and Gustav comes in, the pest has way too many bullets. The pistol he has holds one bullet, not 15 or however many he fired.
Continuity mistake: At the festival, when the Pest walks over to Xantha he's holding a cup in his hand, when they switch camera angles the cup is gone.