Revealing mistake: It's clear that the sound of the ringing phone is impersonated by somebody vocally, off-screen.
Monster a-Go Go (1965)
1 revealing mistake - chronological order
Directed by: Bill Rebane, Herschell Gordon Lewis
Starring: George Perry, June Travis, Lois Brooks, Philip Morton
Revealing mistake: It's clear that the sound of the ringing phone is impersonated by somebody vocally, off-screen.
Narrator: What you are about to see may not even be possible, within the narrow limits of human understanding.