At the end of the episode Paul is seen standing between Perry and Della about equidistant from both holding a cigarette in his left hand between his index and middle fingers. When the shot switches to a close-up, Paul is closer to Perry, leaning slightly behind him, and now his cigarette is between his thumb and his index finger.
Perry: You certainly must remember signing these checks.
Nelson: I sign a hundred checks a day, automatically, without even looking at them.
Perry: Carelessness doesn't relieve you of responsibility.
Nelson: I know.
Perfume counter display by Carven.