I want to talk about this while Jessica Rabbit is still in the competition: How did Who Framed Roger Rabbit keep such a consistent and earnest tone? I watched it earlier today and for what it's about, it's pretty self aware but doesn't drag itself down over the toony bits. Roger Rabbit was always committed to the bit even when it got him and Eddie in trouble (and Eddie rightfully chews him out for it), but it's because Roger always lives by the idea of making people laugh and be entertained and it's in his nature as a toon to act that way. I think that honest nature is probably why Roger felt less grating as a comic relief than the more malicious, stupid, and "Erm, Awkward!" iterations of comic relief.
And Judge Doom too felt like a proper menacing antagonist despite also being goofy as fuck. The name, his evil plan, and his mannerisms were all silly before the toon reveal, but it didn't really detract from his presence. The insanity of being a toon probably added to it, honestly.

I'm baffled because, on paper, this SHOULD be a B-tier movie that lasts 6 months with box office dimes to its name at best, but everything clicked way better than what the plot suggested.