A bunch of celebs flocked to the show and the after-party ... and the after-party went on for a long time ... which included Dave Chappelle, Chris Rock, Larry David, John McEnroe, Usher, Questlove, Luenell and Donald Glover.

During the show, Eddie reprised some of his best roles ... Mr. Robinson's Neighborhood, Buckwheat and the house fav ... Gumby! Colin Jost totally lost it during the bit.

As for Mr. Robinson's Neighborhood ... well, it featured a much older Mr. Robinson who's now a property squatter.

There was also an insanely funny sketch about 'Masked Singer' ... you just gotta watch it.

Lizzo performed during the SNL. One of the songs -- "Good as Hell" -- featured Lizzo in a tuxedo-like outfit. The entire back half of the outfit is transparent while twerking ... fun callback to the whole Laker's controversy where she twerked on the hardwood and her butt was exposed.