The Pool Guy - S7-E8
Trivia: When Jerry, Elaine, and Susan are at The Movie "Chunnel", Susan is annoyed while Jerry and Elaine are talking during The Movie. Listen to The Movie dialogue in the background of the scene. The Voice which yells "Everyone out of the chunnel!" is that of co-creator Larry David.
Trivia: The man who returns George's $20 bill and says "Sorry, your highness, but we don't accept bills with lipstick on the president", is the show's co-creator Larry David.
Trivia: Armin Shimerman hated guest-starring in this episode. He has described the four main characters as being dismissive and ignoring him completely outside of filming. At one point, Jerry Seinfeld and Julia Louis-Dreyfus sat down on either side of him, on a bench, and talked "around him" for half an hour, as if he were not there.
Chosen answer: George does mention his brother in the episode "The Parking Space". They actually really never mention anything that contradicts the fact he had a brother though, it just isn't mentioned.