Deliberate mistake: Several times throughout the movie, the same footage is repeated in a loop. For instance, Brenda punches Tanaka in the gut, then in the same camera angle there's a visible and obvious cut to the beginning of the same punch that lands again, three times. It's so apparent that labeling it a continuity mistake is sort of pointless; after all, it is shown deliberately. However, the sound effects inserted are three distinct and different ones, so it's not supposed to be a 'replay' but three different punches. (00:10:15)
Other mistake: To get to the hiding place of Tanaka's macguffin, both Becky and Tanaka are in the passenger seat of the car. The driver is never shown, nor referenced or addressed, and the car just sits there parked. (00:18:10)