- The infamous "bending door" scene was achieved by constructing a prop door composed of rubber. While filming, the bending effect was cause by having a number of stagehands push on the door.
- The names on the blackboard in Dr. Markaway's office are all friends or family of writer Nelson Gidding. Albert Trepuk was his stepfather, Charles Stern, Ruth Murray, Rufus Matthewson, and Paul Kirschner were friends, and Joshua Walden was his then 14-year-old son.
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