Continuity mistake: There's a fixture with a wire hanging down from it in the front left corner of the restaurant. When they built the interiors for this scene they forgot to put it there and when Melanie opens the phone booth door trying to get out the wire hanging from the bottom of the roof of the restaurant is missing. In the close-up as Melanie tries to get out the cord that we saw previously sticking out has been tucked back in towards the phone for this shot.
Continuity mistake: After Lydia cleans off the coffee table when she returns and sits down there are only two boxes and a bowl on the coffee table. When Melanie brings Cathy back from the bathroom there are more than three items, such as an ashtray, on the table and Mitch and Lydia haven't moved from their seats.