When Mule attacks Eli at the convention, Eli forgets to take his jacket off of the couch arm, and leaves it there. Several scenes later in Matt's bedroom, he is seen wearing the same jacket that he left behind.
Danielle's car has blue background/gold lettered California license plates. California stopped making the blue/gold plates in the early 1980s. Her new style Beetle has to be a 1998 or newer. The only way a car that new can have the blue/gold plates is if they are personalized plates which go with the owner. The plates on Danielle's car are not personalized with a special word.
When driving to the porn convention in Las Vegas, Klitz is on the phone with his father telling him that they can watch Shark Week together another night. Shark Week is on in early august, well before they would have started school.
When Matt is getting changed in the dressing room for the big scene he is looking in the mirror and there is lipstick on the hand that Danielle kissed. When he walks towards the door the lipstick isn't there any more. It returns in the next shot.
When Matthew goes over to apologize for being a jerk to Danielle, there is a Mitsubishi Outlander parked across the street when he knocks on the door. After Danielle opens the door and looks out at him, the Outlander is missing and there is a sedan parked in its place.
When Matthew and Danielle are sitting at the table in the diner we see Danielle drawing a picture of a girl with long hair. In the next shot, there is no hair drawn, and in the next shot has long hair again.
When in class Mathew's book is turned to a page with a photo, and then as he looks out the window and the view goes back his book is on a different page. Then when we seem him close his book a second later, the page he was on is an different page again.
At the party when they come out the black door an extra can be seen wearing a grey sweater. When they walk in front of the extra the shot changes and now the extra is in front of them talking to a different girl. Then when we cut back the extra is with a different gang behind them.
When Matthew wants to cut class, we see the campus cop with his car parked in the middle of the road within five feet of the yellow line and there is a sign to the right that says, "Check out with security." When the vehicles full of kids begin to drive toward him, the sign has disappeared and his car is parked next to the curb and far away from the yellow line.
When the limo picks up Eli, Klitz, Matthew, Danielle, and the two porn stars, it shows a close up of the front of the limo as it comes to a stop, and the license plate is a bunch of numbers and letters, but at the end of the night when it drops them off, the license plate is a word.
In the strip club, the waitress brings three drinks to the table. Afterwards in the shots showing Kelly, all three drinks are in front of him, but in the shots showing Matthew, he has one of the drinks in front of him.
In the scene at the scholarship dinner when the camera is in a close up of Matthew and Danielle's microphone is visible in her hair, her hair is shown tied up to hold the microphone, but during the entire dinner her hair is down.
When the door to the library is opened for the porno movie filming to start, one of the porno stars is lying on a table with no one in front of her. When the camera zooms in, the "director" and one of the other stars are standing right in front of the table.
When Matthew is coming downstairs to meet Danielle for the first time, the first shot of Danielle shows her hands in front of her, after showing Matthew's reaction to seeing her the next shot shows Danielle's hands behind her.
At the scholarship dinner, Matthew is with Danielle talking to a couple. When Matthew takes an interest in the man's tie, it zooms into Matthew's face. You can see that there is a microphone attached to the back of Danielle's hair.
The music that plays when Matthew opens the door to reveal Danielle ready to accompany him to the prom is not "Hootchie Cootchie Man" as credited in the soundtrack listing and end credits, but is actually "Mannish Boy".
In the first couple shots of the film where the characters are stating what they will always remember, one says that he will always remember Lacrosse champions. If you watch very closely, when he tackles the last man before the shot is over, the lacrosse ball clearly flies out of the net, but he is still running.
When Matt receives the acceptance letter from Georgetown, it appears to be a "thin" package that would signify a single rejection letter, rather than the more traditional "thick" package that signifies acceptance and contains all the materials needed.