Yeah, SM64 is weird because a lot of '3d' objects used billboarding, it was actually just a flat object always facing the camera, so they don't scale up well. Anything spherical (chain chomp for example).

Hilarious proof: https://imgur.com/gallery/Xw4tN#FoRAGl7

The characters in Mario Kart 64 were like that too, they just prerendered a heap of different angles and inserted the appropriate one.

With recompilation we could change those things, but I'm not sure how much work it would be and how many people who care to play those games would want to alter them that much.

Early 3d games will always have those rough edges sadly.