All three of the other Chock full o'Notes members were previous guests on the show as other characters. David Cross played Mr. James' weird nephew in "Houses of the Holy (1996)." Bob Odenkirk played the doctor treating Matthew's injury in "The Injury (1997)." Brian Posehn played a fan attending Mr. James' book reading in "Super Karate Monkey Death Car (1997)."
Each member of Dave's a capella group has the same first name as the actor playing him: Dave (Foley), Brian (Posehn), David (Cross), and Bob (Odenkirk).
Bob Odenkirk and David Cross were concurrently starring in "Mr. Show with Bob and David."
The name of Dave's a capella group Chock full o'Notes is a play on the name of coffee brand Chock full o'Nuts. Chock full o'Nuts is a brand of coffee originating from a chain of New York City coffee shops.
Bob (Bob Odenkirk) says he quit his law firm to join the group in New York. Odenkirk went on to great success as lawyer Saul Goodman in Breaking Bad (2008) and Jimmy McGill in Better Call Saul (2015).