Anomaly Quests are basically endgame quests that involve a wide variety of missions involving Afflicted monsters.
Cuphead tritagonist Ms. Chalice actually has a secret unlockable skin that will make her look shinier than ever before.
To unlock all Post-Game Monsters in Monster Hunter: Sunbreak, you must reach MR 100.
The Cuphead DLC is pretty fun despite how short it is. However, if you were breezing through the game, then you might not have known that...