Richard Erdman's Twilight Zone episode, "A Kind of Stopwatch"
The last episode of Dr. Ken where Erdman played himself with a number of the cast from Community, Ken's Big Audition.
One of Erdman's most notable roles in Stalag 17, available on the Roku network.
Erdman also had a role in the critically acclaimed Tora! Tora! Tora!
Richard Erdman also worked with Marlon Brando when he was fairly new in cinema. If you have access to the Criterion Collection, you can see him along side Brando (his roommate during the shoot) in The Men.
Richard also directed a movie back in 1973 called Brothers O'Toole. It is available for Prime customers to stream.
Here is Richard Erdman at PaleyFest in 2013 talking about being on set of Community and Leonard.
Richard Erdman on season 5 of Cheers in Money Dearest.