Okay, hopefully this is the last one: if Enemy Promotion is set to Easier Enemies, the fish in the shallow poll in Snowflake Street won't jump. I guess they're getting caught on the ground below them?

Dying as Penguin Cop in the Unfinished Swan room not only doesn't darken the corpse (as it doesn't with everyone else), but also doesn't erase the initial shadow until the reinforcement spawns:

and likewise, the shadow doesn't match the reinforcement's entrance effect.
EDIT: Oh, and the small pinkranite shards don't get darkened, either:

P.S. I just noticed I misspelled "pool" in my last comment, which is rather embarrassing given how many of the issues I brought up with your game were typos. XP