When Miss Walnicki exits the office, she pushes the door out and away from her, but as she steps over the threshold, the door is behind her, inside the office.
A sign in the restaurant where Rhoda works advertises "banannas"; this could be a set design error or a real sign from a location shoot.
While Leonard Tupperman is talking to Samson, he says he is paying $35 'per minute' (should be per hour, or session).