Check out the last sketch in the Oct 7 1978 Rolling Stones episode of SNL, "Danger Probe with Dave Mabel"! Meatballs co-stars Russ Banham and Matt Craven are extras playing guardsman under Bill Murray's Nazi rule in the weird Aykroyd vignette…

I don't recall any further trashing from him, but I do remember (soon after the Leno spot) he apologized for trashing the show, saying he caught some backlash from Sandler and others (I think it was on Tom Snyder's CBS show…)

I recall this exchange between Jay Leno and Phil Hartman on the Tonight Show in Spring '95 (paraphrasing):

Loved the episode! … but wasn't that Flip Wilson and Redd Foxx?

Caught that Mary Tyler Moore episode with Bill Daily. Boy that was a rough one. But it did bring me here five years later…