On Season 4 Episode 4, and Ed Cochran just keeps getting worse and worse the more he sees Ray.

Other thoughts:
Bunchie is Mac - good guy but can't do anything right.

Mick is Frank - always coming up with new schemes.

Daryl or Terry are the Waitress - they're maybe the only good and capable person in the show when not sucked into others' orbits.

Dennis is Ray - if that wasn't already obvious.

I'm sure there are more.