It took four tries for this film to get an R-rating instead of an NC-17.
To replicate an erection in one scene, the crew cooked a sausage, stuck it on a pencil, and wrapped it in aluminum foil. It was still warm when it was placed between Jason Biggs' legs.
The URL for the webcam broadcast that Jim emails (from firstname.lastname@example.org) to his friends is http://126.96.36.199/temp/NadiaVision. The IP address actually belongs to the Department of Psychology of the Johns Hopkins University in Baltimore, MD.
The "pale ale" Stifler drinks is actually beer with egg whites in it.
Members of the California punk band Blink 182 are shown during the Internet broadcast scene. Their song "Mutt" is playing in the background.
Alyson Hannigan was initially offered the role of Heather, but after reading the script she asked to play Michelle instead.
The film originally featured a scene in which Jim's younger brother walks in on him in a sexual act. The scene was cut however before filming started.