Continuity mistake: When Steve and Doug first go to the Roxbury, the bouncer tells them that they can't go in. Then, Richard pulls up in his yellow sports car, and goes into the club, leaving Steve and Doug behind. As Steve and Doug walk to the back of the line, you can see Richard's car parked about 20 feet away from the entrance to the club. Nobody moved it. How did it get there? (00:06:15 - 00:06:40)
Continuity mistake: In the scene when Steve and Doug are walking to work, they have headphones on. They see a woman who they run up to.When running, Doug's headphones are on his head. When they show the scene from a different camera view, they are off. Then when they walk away, they are on again. It never shows him taking them on or off. (00:10:15)
Continuity mistake: In the scene where Doug and Steve Boutabi fight with clothes in their room before going into the kitchen, their robes are green and purple. In the kitchen, though, the robes become blue and purple and than green and purple again.
Other mistake: In the scene where Emily is throwing away all of Steve's stuff, she discards a disco ball, commenting, "Who decorates like this anyway?". But, later in the film, when Steve and Emily are in bed choosing college courses, there is a disco ball (like the one Emily discarded earlier) at the top of the bed. Wouldn't she have thrown that one away too?
Other mistake: In the scene where Steve and Doug are trying to find an ATM to pay off the bouncer at the Roxbury, they keep stopping and starting abruptly. The hanging plants in the back of the truck swing, but the plants sitting on the shelves (particularly the one behind Steve's head) don't move at all and appear to be glued onto the shelves. This is especially visible when the van gets rear-ended by the yellow sports car, the plants don't even budge.
Continuity mistake: In the scene where Doug and Steve are loading the truck Emily comes out from "Bright Ideas" to talk to them. Just after Mr. Butabi says "I see you've picked the right son" we get a shot of a man sitting at a table with a woman behind Emily. The shot changes and then when it cuts back again we see the same couple walking towards the table and sitting down.
Continuity mistake: In the scene where the sports car has rear-ended Doug and Steve's van they get out of the van to talk to Richard. Throughout this conversation, as the shot changes, a few large leaves dissapear and reappear from Doug's head.
Continuity mistake: In the scene when they have dinner just before the wedding, Steve is having a chat with his father opening a wine bottle. In the next shot, the opener is on the table as if he never started to open it. The shot after, the opener is back in the bottle again.
Continuity mistake: In the scene where Emily is throwing away the things she doesn't like that belongs to her soon to be husband, Steve, she has a box to put the things into and snatches the silver necklace around his neck and throws it in the box. But throughout the rest of the movie he has the necklace on!
Continuity mistake: In the wedding scene, when Doug stands on the balcony and blasts music, in one shot of Doug you can see the door to the pool house halfway open. In the next shot of Doug, the door is only a little bit open. This varies as the scene goes on.
Continuity mistake: In the scene where Steve and Doug are walking down the street together listening to "Saturday Night Fever" on their earphones, they walk past a sexy woman and keep on walking and then stop. Steve runs up to the woman to chat her up and he still has his earphones on. Then the shot changes very quickly and his earphones are suddenly round his neck, but then it changes again and they are back on his ears.