1. Prior to the final boss' stage, where you're finding 3 pink orbs to open her boss room door, there's going to be a plant bitch on the opposite side of a room. If you run over to kill her, you'll fall into an invisible pit in the floor that you simply can't escape from. Even if you kill all the enemies down there, you're forced to do the entire level all over again. This goes contrary to everything the game teaches you and is a stupid, annoying trick that has no reason to exist. There aren't even any invisible floor tiles in any levels prior to this one instance.
2. The final boss. She isn't difficult once you figure out what she does, but she A) slowly drains your life the whole fight, which is a problem for a reason I'll get to shortly B) she has a move that basically does instant damage if she glares at you, like the cow lady's big fat titty, and C) she will teleport on top of you like the loathsome cunt she is, pretty much guaranteeing a life (and heals for her) if your health bar isn't full. Fuck off with that gay shit. She doesn't ever teleport prior to the final phase of her fight, so this is almost as stupid as the floor tile trick.