Who are the actors who exist as themselves and as characters they play in-universe?

The original post: /r/television by /u/JynXten on 2025-09-03 19:00:17+00:00.

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In S06E11 of Homicide: Life on the Street, Munch says a guy looks like Steve Buscemi and John Waters combined.

Both of these appeared in earlier episodes. That means in that universe those actors exist, as well as the people they play.

Who else?