Sara Bareilles makes a cameo as the air balloon guide. Her song Gravity is heard in Paradigms of Human Memory (2011).
Annie's most shameful secret is a reference to a story Alison Brie told in an interview on the David Letterman show. She related how a stranger was obsessed with her feet and wanted to give her what he claimed to be a strictly platonic foot massage.
When they meet the Mountain Man, Jeff says, "And I thought my hair looked fake." This is in reference to the actor who plays the Mountain Man, Jason Alexander, wearing a luxurious wig for the part. For most of his notable career Jason Alexander has been partially bald.
During the tag scene at the end of the episode, the puppet characters hum the song "Daybreak," which is often hummed by various characters over the course of the series.
At the very beginning, when the group is in the study room, the white board behind Annie and Shirley reads as follows:
"Until further notice, the union bldg will have some spaces available if needed. Thanks for your patience as we are presently working to resolve this problem."
"Until further notice, the union bldg will have some spaces available if needed. Thanks for your patience as we are presently working to resolve this problem."