: Fans pointed out a significant break in continuity during a flashback to the Season 2 episode "Cooperative Calligraphy". The flashback shows them refusing Leonard entry during the search for Annie's pen, despite the original episode stating the school was empty due to a "puppy parade".

" Alternative History of the German Invasion " is the fourth episode of the fourth season of the NBC sitcom , originally aired on February 28, 2013. The episode centers on the study group's conflict with a group of German students—returning from a previous season—over the use of their iconic study table at Greendale Community College. Summary of Plot and Themes

The episode is notable for receiving largely negative reviews from critics and fans alike.

: The episode’s narrative hinge is the realization that the study group members are perceived as the "villains" of the school. Through a series of flashbacks, the episode shows how they have consistently hogged the study room and excluded others, such as when they refused to share the space with Leonard.

: This episode aired during Season 4, often referred to by fans and later by the show itself as the "gas leak year" because original creator Dan Harmon was not involved. Critics noted that guest stars like Malcolm McDowell felt underused and the character writing felt "off".