Multiple Mirror Effects in Movies

These Glamour Girls (1939)

Spoiler Alert !

Some of these pictures and descriptions may give away plot details that you might not want to know before watching the film.
 
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A bunch of upper class college students go into the mirror maze at an amusement park. In the comic confusion of the maze a couple gets separated then re-united, a girl overhears catty things said about her by the other girls who don't know she's listening, and wealthy Phil (Lew Ayres) tries to apologize to working girl Jane (Lana Turner) for forgetting that he invited her to the party when he had another date - his fiancé, but she puts him in his place.

Watch the scene on YouTube