"Community Cheat Sheet" is a series of online videos which were released by Yahoo Screen in promotion of Season Six. The videos focus on inside jokes, easter eggs & deep cuts hidden in every season of Community. The first video was released on March 6th 2015.
They can be viewed at: https://hk.tv.yahoo.com/community-cheat-sheets/ . Note that they automatically load in reverse order.
Here's a list of them:
Intro to Easter Eggs - Looks at some Easter Eggs from past seasons.
The English Changuage - Looks at the coined and minted vocabulary from past seasons.
Romantic Geometry - Looks at the various study group romances from past seasons.
Recap-turing the Magic - Looks at season 6, episodes 1 and 2.
The Pelopo-DEAN-sian War - Looks at season 6, episode 3.
All the School's a Stage - Looks at season 6, episode 4.
The Human Beings - Looks at season 6, episode 5.
Secrets of the Lunch Lady's Emails - Looks at season 6, episode 6.
Advertising 101 - Looks at season 6, episode 7.
Madcap Movie Mayhem - Looks at season 6, episode 8.
The Jim Belushi of Jim Belushi Jokes - Looks at season 6, episode 9.
It's in the Tag - Looks at season 6, episode 10.
How to Kill a Man With Paint - Looks at season 6, episode 11.
Winger Saves the Day - Looks at season 6, episode 12.
Will There Be a Movie? - Looks at the future after season 6, episode 13.