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Changenesia is defined as "the complete loss of memory caused by a sudden trauma that was, itself, also forgotten."

GOOF: Britta isn't interested in Inspector SpaceTime in this episode at all, and even asks Troy if the show has really been on for 50 years. Yet in "Biology 101" Britta is the one who introduces Abed to Inspector SpaceTime, so she had to have some interest in the series if she's the one who introduced it.

In Troy's air-conditioning class, the board reads "This is my Limpkin wrench. There are many like it but this one is mine! My Limpkin wrench without me is useless--my Limpkin wrench is part of me."

Evil Abed is a reference to season 3 episode 4 "Remedial Chaos Theory."

Goof: When Abed enters the apartment to recruit Troy, Troy is eating a sandwich. It alternates by Troy holding the sandwich to it sitting on the plate with no time to pick it up or put it down.

When Troy emerges from the blanket room, he is humming the same song that played on the radio during Abed's Halloween story.

One of the green screen videos in the background shows the ship from the 1978 show Salvage 1.

In the second to last scene, Pierce is shown throwing away the present he brought for Troy. Few seconds later, when Jeff returns, he can be seen doing the same thing again.

In the first shot, Annie asks Britta "didn't they say 304?" at the door of Troy and Abed's apartment (No. 303) and Britta responds "No, 303, I wrote it down twice".

This is a reference to the fact that this episode was shot as the third of the season and planned to air as 3x03 but was later changed to 3x04. Gilian Jacobs wrote the joke after the change was made.

Actors Busy Philipps and Dan Byrd who are stars on the show Cougar Town make a short cameo appearance toward the end of the episode when Greendale celebrates its win in the paintball game. Cougar Town was referred to several times in the episode "Critical Film Studies" when Abed explained what a big fan of the show he is and how he got invited to the set of the show, which indeed occurs as Danny Pudi had a background cameo in the Cougar Town season 2 finale "Something Good Coming".

Jeff's costume is the same one he wore in "Introduction to Statistics"

The Jeff/Annie shipper video to "Gravity" in the middle of this episode was influenced by a real life fan video, found on YouTube

In this episode Abed is an expert of "Who's the Boss?" but in the episode "Communication Studies" he says that he never saw more than the opening credits of the show.

Pierce's Hawthorne Manor wine has the Italian motto "La tua diventa più bello con ogni bottiglia," which literally translates to "Your becomes more handsome with every bottle." Note that it actually reads "your" instead of "you" and "becomes" instead of "become." The sentence doesn't actually make sense in Italian.

In the opening scene, Annie waves the flag in her hand when she says that one of the dishes is popular in Ghana, likely to imply that it is the Ghanese flag. However, the flag that she is holding and several others in the room are in fact Zimbabwean.

Goof: When Troy and Abed are giving their first comments on the candidates, the profile on Jeff shows his Kryptonite as "Women's Tears". However, the word Kryptonite is spelled without the "r".

In Aerodynamics of GenderAbed's visor features a foreshadowing note about Troy's birthday being in 2 weeks.

In Abed's visor in the episode "Aerodynamics of Gender" has a Memo of building a blanket fort and he does build one in this episode.

At the end of the episode, we finally see what has happened to Troy's pet monkey, Annie's Boobs, from Season 1's "Contemporary American Poultry". If you look closely, you can also see a small hand grab Annie's purple pen off the table at the beginning of the episode, while the Dean is telling everyone about the Puppy Parade.

This episode featured a new opening credits sequence that was special and exclusive for Halloween.