It's not just not-then-stars like Bruce Willis and Helena Bonham Carter (although I squealed a bit when I saw her--so young! And she's Crockett's tragic love interest, which is complete win). It's baby versions of actors I barely know (I almost didn't recognize John Glover in last night's ep--an accent all over the place, buzzed blond hair?).
And it's people who were at the start of their careers. Night before last, Tubbs was stalked by a drug dealer, and I went through the whole episode not even cluing into the fact that the dealer's main sidekick seemed familiar. Near the end, this guy turned a certain way and I was like, "HEY. Is that Vincent D'Onofrio? No, can't be. Doesn't sound like him or anything." But when I went back to the credits: Vincent Philip D'Onofrio, right there on the screen.
I'm still amused by this. Almost every ep there's someone I know from film or TV or both.