Revealing mistake: Near the end, there is a scene of the bad guy hanging upside down on Mt. Richmore. In the top left is an odd line going through the shot. It looks like the background (the out-of-focus house) is placed behind the man and poorly blended with the shot. Incredibly obvious on the Netflix version. (01:28:17)
Revealing mistake: When Macaulay Caulkin has all his friends over and they are riding the rollercoaster there is a section of it missing.
Suggested correction: The "missing" track is the car loading track for the station.