In the opening scene, stage hypnotist Alex Gregor invites a drunken heckler to the stage and attempts to hypnotize him. A real stage hypnotist would never work with a subject who was under the influence because alcohol interferes with the brain's ability to receive hypnotic suggestions.
The goof item below may give away important plot points.
Nina pulls the crown back from the supposed wax figure, revealing the blonde hair underneath the crown and black wig. The next shot of the body shows the crown and wig back in place, and then a third shot shows the crown and wig pulled back again.