- Continuity: When Brennan is singing at the Wine Mixer, he holds a note that shatters the glass helicopter sculpture. At the end of the song, when his mom and stepdad are smiling, the sculpture is intact in the background.
- Continuity: During the first dinner scene, the ketchup bottle goes from top to bottom and back between shots.
- Revealing mistakes: During the school yard fight at the end of the movie, the "students" are clearly much older stunt doubles.
- Continuity: During the Christmas scene, Robert eats a tree-shaped cookie while drinking. When he gets up to leave, the cookie is whole again.
- Audio/visual unsynchronized: During Brennan's song at the Catalina Wine Festival, the drums don't match up with what Dale is playing several times.
- Crew or equipment visible: After the drive home following the Prestige Worldwide presentation, the boys burst into the house. A crew member in black clothing, trying to stay out of the shot, is reflected in a mirror beside the main entry door.
- Errors made by characters (possibly deliberate errors by the filmmakers): In the treehouse, Derek tells Brennan and Dale that he "hasn't had a carb since 2004." In the dinner scene just before that, he drank a Heineken. Beer is mostly carbohydrates.
- Continuity: When Brennan is showing Dale how good a singer he is, a samurai sword is on the floor between them. When Brennan stops singing and stands up, the camera angle changes. When it goes back to Dale, the sword is gone.
- Crew or equipment visible: When the two brothers are on the boat, we can clearly see the reflection of the camera in the polished metal arm under the wheel of the boat.
- Continuity: Right before the brothers meet the schoolyard bullies, one scene shows them already meeting the bullies face-to-face, while the next shot shows them still walking there.
- Continuity: During the scene where Dale asks Brennan if he touched his drum set, Brennan holds the remote with his left hand - the camera angle changes we see Brennan holding the remote with his right hand.
- Continuity: In the treehouse, the magazine in Brennan's hand disappears and reappears between shots.
- Audio/visual unsynchronized: As Derek and his family sing "Sweet Child of Mine," Derek's audio track is clearly off as Tommy sings his solo, especially in the shot of Derek and Alice as the camera pans back to Tommy.
- Continuity: In the treehouse, Derek puts his beer down on the floor. In the next shot, he is holding his beer again. In the shot after that, Derek shows his hands, with no beer.
- Audio/visual unsynchronized: At the Wine Mixer, Dale plays drum rolls with yarn mallets, but it sounds like he's using drum sticks. Performing a drum roll with mallets would sound very different, and be a lot more difficult.
- Factual errors: We learn at the beginning that Brennan is 39. Later, during a bedroom scene with Dale and Nancy, we learn that Brennan was 17 when his brother, Derek, won a talent show by lip-synching "Ice Ice Baby." That means the talent show was in 1986. "Ice Ice Baby" was released in 1990.
- Continuity: When Robert and Nancy say "No television for a week" Brennan throws his ice pack down in one view and Nancy says, "We are so serious," Brennan throws the ice pack down again.
- Continuity: As Brennan is finishing up his song, during his high note, the camera switches over to the ice sculpture of the helicopter - which explodes. In the very next scene the camera switches to his "parents" clapping for Brennan, and behind them the helicopter is still clearly visible, undamaged. The helicopter appears a few more times before the movie shifts from that location.
- Continuity: When Brennan is eating the special sauce, some is spilled on the side of the bowl. When there is a different shot, the special sauce is not spilled on the side of the bowl.
- Continuity: When they are eating Christmas dinner Alice takes off her wedding ring, but when she is in the other room with Dale her wedding ring is back on.
- Continuity: During Christmas dinner, Tiffany shares that she was given a pearl necklace for Christmas. During the singing scene in the car, the same necklace can be seen on Tiffany's neck.
- Continuity: When Brennan is showing Dale the samurai sword with Randy Jackson's autograph hiss hands change position between shots. When Brennan is facing the camera he has both hands on it. During the shot over his shoulder he only has one hand on the sword.
- Crew or equipment visible: During the scene where Robert and Nancy are in the bedroom after he gets back from the Cheesecake Factory, a crew member's shadow is cast across Robert just as he is about to sit down.
- Audio/visual unsynchronized: During the drumming close ups at the wine mixer, the woman in the red dress in the background changes. In some scenes she's rather slender, in others she is heavy set.
- Continuity: When Dale and Brennan are throwing Christmas presents while sleepwalking, only two smaller boxes land on the top of the bed. When they come back for round two, there are several larger presents stacked up at the foot of the bed.
- Continuity: Brennan is in Randy's office asking to be given the task of the Catalina Wine Mixer. Derek comes in and says to Randy, "Did you tell him the deal?", obviously making it clear he already knew that Brennan was given the job. However, after hearing Brennan out, Derek then decides to give Brennan the job. (In the DVD extras, this goof is explained because an alternate take (entitled "Catalina Heart Attack") shows Randy giving the job to Brennan without Brennan needing to ask for it, or repeat his request to Derek. Then Derek comes in and says the same line.)
>>> WARNING: Here Be Spoilers <<<
Goofs below here contain information that may give away important plot points. You may not want to read any further if you've not already seen this title.
- Continuity: SPOILER: Brennan rubs his testicles on the drum set. When Dale knocks him to the floor, Brennan's testicles are still out. When he is fighting Brennan, his pants are zipped up.
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