The blonde waitress who George thinks is flipping him off is played by Lauren Bowles, Julia Louis-Dreyfus' younger half-sister.
One day after the episode first aired, Ian Abercrombie (who plays Justin Pitt) was having lunch in a restaurant; while he was waiting for his coffee, the waiter put a plate with a Snickers bar on his table. Apparently, the whole restaurant was in on the joke.
Elaine's outburst at the end is a reference to Mia Farrow's outburst "You maniacs!" at the end of "Rosemary's Baby."
The voice of Dan (portrayed by Brian Reddy) was not that of Reddy himself. It was that of a voice-over actress. Reddy's voice wasn't high-pitched enough.
George tells Jerry that he didn't have a mantle growing up; however, in the second-season episode The Statue, he tells Kramer that he had a statue on his parents' mantle growing up.