Yeah this was the best episode of the season so far. Centred around Greendale and gave the recurring characters the chance to shine. New it was going to be golden within the first 15 seconds with Garrett's "its as informative as it is delicious!" line and Troy cursing Annie for getting him confused about 'The Real World'. The Germans were brilliant and all their obscure references made me laugh with the one about "pulling a Gretta Weitz in our trousers" really standing out. Dean Pelton was great in the beginning with the 'he's always Dean that' when discussing Chang inserting his name randomly into sentences and talking about not having a madman around campus whilst the assistant comes in with a new dress
Particularly enjoyed the flashbacks from the other character's perspectives, such as Garrett booking the study room during the episode where they lose a pen. Jeff telling the girl to come back later because he had a point to prove had me in fits of laughter. Leonard pointing out Shirley was wearing 'an SS shirt' when calling her a Nazi was also a great moment. Special mention to Troy's face during the alternate study room when a foul odor enters the room and Jeff's face during the Chang appearance.
Felt like a typical Community episode and I hope they keep more episodes based in Greendale since that's generally where everything clicks together superbly.