Goofs

On the first day of school when Will and Layla get on the bus, they sit near the back by Zach, but when the bus arrives and Ron opens the door, Will and Layla are the first to get off almost immediately after he opens the door. They even stop to talk to Ron and there is no one behind them waiting to get off.

At the Homecoming Dance, Mr. Boy offers Layla a drink. Lash reaches out and spills the drink on Mr. Boy's shirt, but there is still a good amount of liquid left in the cup. At the very next shot, however, when Layla is handing him a napkin, Mr. Boy's cup is completely empty.

When Will Stronghold and the Commander in the kitchen, the Commander slams on the counter and the knives stay perfectly straight. In the next shot, they are tilted.

On the first day of school, the bus is shown driving on an unfinished bridge as a launching point for takeoff. While on the bridge trees can be seen in the background, and the bridge is about as high as the tops of the trees. When they launch off the end of the bridge, as the bus is transforming into a plane, there is a view looking down that shows them hundreds or even thousands of feet above the city.

When Will is sent to the nurse, the nurse was wearing a stethoscope around her neck, but when she turned sideways to put the equipment back, she turned to face Will again, and the stethoscope was gone.

Will doesn't actually step on Medulla's foot in the mad science laboratory.

This is an intentional Goof showing Medulla's prissy nature. It's supposed to be funny.

When The Commander & Will go down to the Secret Sanctum, Will uses his mother's pole which is on the left. In the next shot, Will is shown coming down the right pole. The next shot was taken from the other side of the characters, from the Secret Sanctum. Therefore, they are still on the same poles, just the scene looks different.

When Steve tells Will that most students at Sky High have one super parent, not two, he holds up two fingers for "one super parent", & one finger for "not two".

Obviously a deliberate error for humorous purposes.

Will is flung from the platform and he lands very hard. Not only is he not hurt, but he gets up like nothing happened. Will is not supposed to have his powers at this point in the film. He seems to not have any damage to his body, and he should have been hurt.

Warren's lips don't move in the over-the-shoulder shot of him talking to Layla in the Paper Lantern.

During the "Save the Citizen" scene, when Lash is blown into the air, you can see the line behind him that lifts him. (DVD Version)

When Principal Powers disappears through the gym door, the stage light is visible beneath and behind Coach Boomer

When the Commander takes the call from the Mayor you can see the reflection in his glasses of the fabric webbing in one of the softbox lights.