I didn't realize he/she was in that

Bob Odenkirk was a porn actor on 'Curb Your Enthusiasm.'
He was part of the 'Ben Still Show' cast.
He was one of the leads and co-creators of the very excellent 'Mr Show.'

 

John Mahoney in Cheers playing a hack advertising person before playing the father in Frasier.
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The lady who played Roz also appeared on Cheers. She was a reporter interviewing Woody when he was running for city counsel. One of the last 5 episodes or so.

 

Peri Gilpin was on an episode of Law & Order I watched the other day. Don't ask me which one. I watch too many.

 

I've been revisiting a fave, the never-to-be-released-on-DVD series "Ed," online recently. Lo and behold, there's a Jim Parsons sighting from 2002.

 

Two 'Losties' popped up on my netflix viewing this week.
Terry O'Quinn, best known in the role of John Locke, played the Chairman of the Joint Chiefs of Staff in season 6 of West Wing
Daniel Dae Kim, who played Jin, was the ER doctor in the movie "For Love of the Game"

 

Kevin Bacon in "Animal House"

 

All is well. Remain calm.

 

O'Quinn was a notable character actor for years. He played Billy the Kid's lawyer in "Young Guns" and the mayor on "Tombstone."

 

Thank you, sir, may I have another!

 

Cloris leachman as the chatty hooker in butch cassidy and the sundance kid.

 

Friend of mine on FB blew my mind: Thor on Adventures in Babysitting is Vincent D'Onofrio.

 

Was also the toe-sucker who gets kicked in the face by Carell's character in the 40-Year-Old Virgin.