Revealing mistake: When Rocky climbs the RKO tower, he carries lifeless Frank-N-Furter on his back. In the wideshots facing the stunt doubles' backs, while Rocky has both of his hands on the tower, the very much dead Frank-N-Furter has his right arm firmly around Rocky's neck to hang on.
Revealing mistake: When Tommy's parents die he puts their hands together. As the camera shows the close-up of their hands his mother's pinky finger twitches.