Visible crew/equipment: When Sarah and Eddie return to the saturation chamber after losing the other two, the camera shot is high up looking down into the room from a corner. In the upper right hand corner above the saturation chamber you can see the microphone fully in frame and "hovering" as they re-enter that room. It is also there a second time after the camera angle changes.
House on Haunted Hill (1999)
1 visible crew/equipment mistake
Directed by: William Malone
Starring: Famke Janssen, Geoffrey Rush, Taye Diggs, Peter Gallagher
Deliberate mistake: When Eddie and "Jennifer" are walking around the house alone, she is trying to tell Eddie that she's really Sara. But by the time she is explaining that, Eddie has disappeared. She doesn't find him until later. But from the moment she finds him (and he is talking to her) he calls her Sara, despite never actually hearing her say that. Also, after they all get back together, a few of the other people start calling her Sara as well, but no one actually heard that either.
Melissa Marr: Now, that's enter-fucking-tainment.
More trivia for House on Haunted HillMore questions & answers from House on Haunted Hill
Answer: Its just an illusion by Price. His rides are meant to confuse you. Like the tower ride looked like the cable broke and was falling to the ground.