Deliberate mistake: Mr. Medulla said that Will stepped on his foot when he was walking to his desk. If you look closely you can notice that he stepped over his foot instead of on it.
Sky High (2005)
1 deliberate mistake
Directed by: Mike Mitchell
Starring: Kurt Russell, Kelly Preston, Michael Angarano, Danielle Panabaker
Audio problem: When Will meets Layla at the bus stop he says to her "You're not going to believe what happened to me last night," however his mouth continues to move after he says this. (00:59:00)
Will: Oh My God...I made out with an old lady.
Trivia: Principal Powers says, "I'm not Wonder Woman, you know." She is played by Lynda Carter, the original Wonder Woman for the TV show.
Answer: Will took Gwen to the Secret Sanctum. Later it's revealed that Gwen is really Royal Pain and since she saw the location of the Secret Sanctum, she would have told Speed, not Lash, as his super speed would be able to get him in and out without setting off the alarm. If Lash had tried to get into the Sanctum, he would have been caught.
He entered while Gwen was still visiting for the first time before she left.