The gold frame around the peephole in Monica and Chandler's apartment was originally the frame of a mirror, but was broken before filming began, and it was decided it should be kept anyway. See more...
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Other: When Rachel leave her message on Ross' answering machine she mentioned the name Michael after 17 seconds and "I'm over you" after 25 seconds. When Ross listen to the tape he asks "Who is Michael ?" after 8 seconds. Rachel flips the phone out of his hand after 18 seconds so he couldn't heard her "I'm over you".