In the opening scene Pierce says, "We only sang the last two words. What happened to the "happy birthday" part?". At the time this episode was made Warner/Chappell Music claimed copyright to the happy birthday song and collected royalties every time the song was used in a movie or TV show, taking in about $2,000,000 a year. Writers and directors got creative in implying "Happy Birthday To You" without actually using it. In 2016 the song was declared public domain.
The study group gets a cake reading: "Hello during a random dessert. The month and day of which coincide numerically with your expulsion from a uterus." for Troy citing his being raised a Jehovah's Witness since they do not celebrate holidays or birthdays as part of their faith. Donald Glover was raised as a Jehovah's Witness.
Donald Glover's character is turning 21 in this episode while in reality he was 27
Both Paul F Tompkins and Alison Brie are in this episode. They later appear as husband and wife in the Netflix series BoJack Horseman (2014).
Annie's ID / Texas DL 97462820B / EXPIRES: 11-4-2017 / Caroline Decker / 20067 Moonfish Lane / Corpus Christi, TX 78418/ SEX: F / HAIR: BRN / EYES: BRN / HT: 5-4 / CLASS: C / DOB: 11-4-1987 / Organ Donor: Yes