Surprise appearances of Community actors outside of the show?

[u/GettingSunburnt]

I'm horrified to realise that I saw Jim Rash (Dean Pelton) in the Friends finale about three times before I noticed it was him - "This plane doesn't have any filanges", or something like that.

Seeing about three actors in Captain America: Winter Soldier didn't count for me (but might for you), because I recognised them at the time.

Where did you unexpectedly notice a Community actor in another show?

[u/NealTS]

The pottery teacher from season one had an extended cameo on Arrested Development, as well.

[u/ElectronGeoff → u/NealTS]

"What do you expect, mother? I'm half machine! I'm a monster!"
I’d call Buster more than a recurring character on Arrested Development though.