Hot Ticket - S6-E4
Character mistake: In the last minute of the show, Frasier and Niles set to leave the bar. Frasier puts money on the bar to pay and the wife comes over and talks to them. Frasier moves the remaining money to his other hand. You can see his hands slightly twitching, and he accidentally drops the money on the floor, but acts like he is putting it in his pocket instead of picking it up, and leaves.