Continuity mistake: A different "Carlos" baby can be seen during the apartment scene, in which the baby the guys bring to the apartment is different than the baby used during the breastfeeding shot. The two babies have different face and eye shapes.
Continuity mistake: There are two metal bars that stick out under the car when they meet the Chinese gang, and then turn into three metal bars under the car.
Continuity mistake: In the scene after the naked guy jumps out of the trunk and they recover from his tire iron. The sun magically changes from high in the sky to almost sunset and back again through the entire scene.
Continuity mistake: When the guys are sitting down for breakfast, it is clear that in some of the far away shots during that scene "Carlos" is not the same baby as the shape of the baby's eyes are different.
Continuity mistake: At the beginning, Phil says to Tracey on the phone regarding the wedding, "That ain't gonna happen." In the end when we loop back to that scene, Stu tackles him before he can say that line.
Continuity mistake: In the scene where Alan says Doug is clear to move into the right lane, right after the truck starts to swerve, the camera switches to showing Phil and Stu. There is no truck in the frame, but when it shows Alan and Doug, you see the end of the truck passing them.
Continuity mistake: When their apartment room is messed up you can see some wine bottles all lined up just like bowling pins. In the next shot when Stu gets up from the floor it shows the main door of their apartment room and the wine bottles are no longer there.
Continuity mistake: When Alan and Doug the drug dealer are suggesting more accurate names for roofies, Doug places one hand on his hip with the other down by his side, but in the next shot, both hands are resting on his stomach. (01:21:30)
Revealing mistake: When the guys are on the bench and the kid is taking a photo of them with the cell phone, when the scene cuts back to behind the kid before the phone is kicked, the phone is just on the standard main screen. The camera is not even on.
Continuity mistake: In the scene in the police station when the two cops have the taser class in front of the kids, Alan gets tased in the neck and fall on top of the table in front of the classroom and his arms arms are facing upward toward his head. Moments after that, there is a shot from the back of the classroom and Alan's arms are in a normal position by his side.
Continuity mistake: After Mr. Chow runs away, you can see that the crowbar is in a different place from where it was when he dropped it.
Other mistake: Isn't it supposed to be the weekend? Why is a classroom full of kids taking a tour of the police station on a Saturday?
Answer: In the pictures, it is Stu that is fighting with Wayne Newton. It could be assumed that Phil got involved afterwards, but it is never shown.