Continuity: When Jake jumps down off the table, you can see a paw on Bob's lap from a second dog that was removed entirely from the movie.
Continuity: When the mother is taking the pillows off the bed she takes the same pillow off three times.
Continuity: When Sean goes to the "Frat" party and sits on the couch, the couch he sits on changes between shots.
Continuity: When Shaun leaves the Frat party and starts to walk around the campus his hair is messed up. Then he meets Professor Skinner and his hair is neat and parted in the middle. After speaking with the professor about his writing he leaves and his hair is messed again.
Revealing mistakes: At the end of the film when Shaun and his friends are on the beach, he decides to take up surfing again. Shaun and his friends pick up their surf boards and run towards the water. However, the sun is setting and the sea is really calm. There are no waves at all, not even a ripple.
Continuity: When Shaun goes to ask his father for help in getting into Stanford, his father is wearing a grey sweater. A short while later he is wearing a black shirt.
Continuity: When Ashley confronts Tanya about not helping Shaun get in to Stanford Ashley's left hand is placed on her hip. In the next shot, her left arm is down at her side and she now has her right hand on her hip.
Continuity: When Don Durkett moves to get close to Shaun while Shaun is seated on the couch, Ashley is on Shaun's right. When the shot switches to show the shot over Shaun's shoulder, Ashley is on his left. The next shot, she's back on his right.
Continuity: When Bob rolls down the stairs and hits Arthur Gantner's car, the bandage can be seen. There is no bandage on his head from the view inside the car. In the next shot, the bandage is back again.
Continuity: When Tanya is seen with Arlo and Chad at Lonny's memorial, she has no drink in her hand. She then leans over to make-out with Chad and she has a drink in her left hand.
Audio/visual unsynchronized: When 'Lupe' is talking to Colin, The Subtitles read: 'Double pay on weekends?' while her mouth is saying 'OK'
Continuity: While at the Dean's house, Ashley asks Shaun about his brother's aspirin (drugs) and Shaun reacts shocked and nervous as if he somehow already knew she gave some to the Dean, but he was out in the car obtaining his transcript when she did that - so obviously he would not have known.
Errors made by characters (possibly deliberate errors by the filmmakers): The kid talking to Ashley at the party mentions that he got 50 bonus points for his use of the word "mazer" in Scrabble. 50 bonus points are awarded only when a player uses all of their letter tiles in a turn. You have 7 letter tiles per turn, so there is no way he could have received the 50 points under the rules of Scrabble.
Continuity: When Bud leaves the house to discuss getting a divorce with Krista, there is only one car parked at the house, a Nissan Pathfinder (Shaun's car). There is no car belonging to Bud parked in or around the house. Bud mentions he drives past the house on his way home from work. But where is the car, and how did he get there?
Continuity: Cindy wheels Bob out of the house onto the front stoop just before he falls down the front stairs. She is clearly visible beside his chair as he begins to roll. When he hits the car and the camera points towards the front stoop, Ashley is seen standing and watching but Cindy is not on there.
Errors made by characters (possibly deliberate errors by the filmmakers): When Lance is talking about his T-Shirt idea, his hand moves across his chest the opposite way that the words would be going.