Continuity mistake: At the beginning when the guy moves in with Jennifer Aniston, they are walking to their jobs in the morning and she says that the buzzer doesn't work. Well for the whole movie the buzzer is heard clearly and if it didn't work then how would she have heard him when he came in the first place?
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Suggested correction: The bell works so they can hear when someone is at the door, but the buzzer doesn't work so they can't buzz people into the building, they have to go down to the front door and let them in.
