Although this episode premiered in 2000, it was produced in 1999 according to the credits.
The episode won an Emmy Award for Outstanding Individual in Animation - art direction.
In "Cover Up", while Buttercup is searching around the house for her blanket, the laundry room depicts what rather appears to be two clothes dryers or questionably either one being a clothes washer. The only front-loading washer to ever exist in real life with an opaque door instead of a glass one is a Maytag Neptune manufactured from the late 1990s until sometime in the 2000s.