the most notable thing I've found to date was an instance on a planet where I found an avian shopkeeper house and stayed around the area to cut down trees, and when I ran back to the house when night came, there were suddenly TWO of the same avian in the house. Somehow he'd cloned himself! I have a suspicion what happened is the game got confused if he was sitting in the chair or sleeping in the bed and then accidentally doubled him as a result. they both were shopkeepers and sold the same items of clothing. at the very least, they seemed happier living together than as one avian living on his own. Anyone else found odd glitches that they've managed to get on screenshot? Please post them here! I find them pretty funny, to be honest.
I've never seen cloned npc's in any shacks. The most funny things to me are the poop weapons and sewer mobs.