Annie and Jeff both criticize Marvel comics films, an inside joke at the expense of Joe Russo and Anthony Russo who worked on Community prior to directing films for the Marvel Cinematic Universe.
When Abed says 'cool' six times, one for each season, Chang farts during the fourth cool, which is another "Gas leak" reference to the fourth season of the show having the lowest ratings, due to creator Dan Harmon being fired.
The '#andamovie' tag at the end of the episode hints at the #sixseasonsandamovie fan theory coming true, but Joel McHale has said that there would only be a film if Dan Harmon wrote it.
The biggest difference between the show's 5 seasons on NBC and its final year on Yahoo! Screen was that the streaming year allowed Dan Harmon to make episodes without specific lengths, and it became a Season 6 trademark to have extended "tag" scenes at the end of each episode. In the series finale, also, two of the main characters (Britta and the dean) drop the "F-bomb" for the first time.
Throughout the season, the whiteboard behind Annie and Elroy has featured an alphanumeric code relating to the production code of the episode; for example, this episode features "GC613," meaning "Greendale Community College Season 6 Episode 13." This episode, the whiteboard also features the IMDb name IDs for each lead actor's IMDb page. Elroy Patashnik played by Keith David is the most visible at the very bottom.