The guitarist who joins Robert California is Linda Taylor, the same guitarist who performs in ABC's "Whose Line Is It Anyway?"
The local sportscaster that plays drums is Steve Moore of the band Rick K. and the Allnighters, from the viral YouTube video "This Drummer Is at the Wrong Gig." At the end of episode he performs moves similar to the ones in the video.
In the cold open, Andy has Erin pretend he has an important phone call while he is in a meeting with a client. Michael did the same thing in the season 4 episode "The Deposition" when he is talking to Ryan in his office. He has Pam give him a post-it note that says he has a very important client on the line, which isn't true. Just like the plan backfires on Andy, it also backfires on Michael, as Ryan insists that Michael take the important call.