Character mistake: In the scene where Steve and Josie prepare to leave to fight the giant robot at the beginning of the movie, Steve tells Will "Oh, Will, a reminder: a lot of the kids at Sky High will only have one super hero parent, not two." When he says "one super hero parent", he holds up two fingers. When he says "not two", he holds up only one finger.
Visible crew/equipment: When Shane is talking to Mrs. Plummer before she leaves, throughout the scene the camera man is reflected in her window (he is in black, not to get confused with Shane's white shirt) and as the car drives away the camera is shown backing up in the black door.
Factual error: In the scene in the glass elevator, when Mike Teavee wants to push a button, he presses the TV Room button. The elevator stops going down and immediately moves horizontally. The characters within the elevator are thrown against the wall from the sudden change. However, they are thrown against the wall that is in the direction the elevator is now moving, instead of the opposite wall as they should have been. (01:20:15)
Continuity mistake: Look at the dirt when Herbie backs away from the nose of the newer Beetle, between the races out in the desert. Although Herbie drove straight up to the newer Beetle, tire marks can be seen where the crew moved the car back and forth to get him lined up.
Continuity mistake: After Casey has turned down Harvard and is skating on the pond, she falls many times. When she falls for the fourth and final time, her hat falls off. In an overhead shot, the camera even shows it laying on the ground above her head. When she gets back up upon seeing Teddy with the zamboni, her hat has disappeared. (01:12:05)
Continuity mistake: After Evangeline has left with Aunt Adelaide, Nanny McPhee enters the children's room, and as she and Chrissie walk to the bed they pass Eric's, Lily's and Tora's beds, with the bare wood floor at the center - there is no rug. However, when Nanny McPhee leaves their room the long red and white rug is at the center of the floor, between all the beds. (00:51:55 - 00:52:55)
Continuity mistake: After his father's funeral, when Drew turns on the ignition and in following shots, the leather band that he wears on his right wrist (not the watch) is clasped with its strap facing his thumb, yet when he passes the sign for 60B, the band goes round the opposite way. Then, when he listens to The Hombres the leather band is flipped back, but when he picks up Global Business Today magazine it's switched yet again, and so on. (01:43:00)
Continuity mistake: In the scene when the Sherminator is talking with Matt after returning from band camp, Matt is wearing a purple shirt. But when Matt asks if "everyone hated his brother", in the reflection of the star trophy on the desk, you can see Matt's reflection, and he is wearing the orange and black striped shirt from the earlier scene where the Sherminator sends him to band camp. Clearly the two scenes were cut together. (01:21:50)
Visible crew/equipment: When Jimmy Fallon and Drew Barrymore are taking their seats after the guy yells peanuts and crackerjacks, if you look carefully you can see some of the seats behind are actually filled with mannequins dressed with clothing. Some of them don't even have arms. (00:38:00 - 00:41:00)