When Luke Wilson is telling his coworkers what they need to do to get into the fraternity, he hands a tiny piece of paper to Matt Walsh. In the next shot, the paper is missing from his hand. See more...
The cafe used in this, when Mitch is speaking with the girl he likes, has been used in "Se7en" (1995), "Training Day" (2001), "Fight Club" (1999), and "Ghost World" (2000) It is believed the cafe is called the Quality Cafe. Even further, the seat the actors are in in each movie is usually the same. See more...
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Old School (2003) - 1 easter egg
Easter eggs are hidden bits on DVDs which if you know where to look can provide all sorts of fun extras.