I noticed he appeared on the show a couple of times prior to ODAAT.

Yup. He had quite the long career. He’s credited with being in things as far back as 1948! (per IMDb)

Here’s a shot from one of the Partridge eps


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Here’s a shot from one of the Partridge eps


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He played a mobster picking on Danny I think. His girlfriend gave him a shiner,it was funny. Michael Lembeck guest starred too, he played a college student. In fact,David Cassidy once dated Whitney's daughter Meredith in the early 70's. Meredith guest starred on the show as well. As a kid, I liked One Day and PF.
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Here’s a shot from one of the Partridge eps


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LaVon LeVine LaVern! :lol:

That one is pretty good. Also has Vic Tayback as one of Pat Harrington's goons chasing after Danny.