Homer's Barbershop Quartet

When George Harrison arrived at the recording studio in West Los Angeles to record his lines, the casting director told the episode's show runners, Al Jean and Mike Reiss, that Harrison was coming and that they were not allowed to tell anybody about it because it was intended to be a secret to the staff. Jean, Reiss, and Matt Groening went to see Harrison in the studio, and when they returned to the writer's room, Groening said, "Guess who I just met? George Harrison!", not knowing that it was supposed to be a secret. Harrison arrived at the studio by himself without any entourage or bodyguards. Groening recalls that Harrison was "pretty glum", and he was unenthusiastic when the staff asked him questions about The Beatles. However, when Groening asked Harrison about the album Wonderwall Music, he suddenly "perked up" because it was one of his solo albums that he was rarely questioned on.

The group sings at the local church with a sign outside displaying the group name: "The B Sharps". However at that point in the story, they hadn't come up with a group name yet. While this most likely is a simple continuity error, it could be a result of the moronic Homer telling the story and getting things wrong.