Before I generated a superflat world, I changed some village parameters.
I set the distance to 9 (default=32) and I set the size to 6 (default=1).
The preset:
3;minecraft:bedrock,2*minecraft:dirt,minecraft:grass;1;village(size=6 distance=9)

Sometimes the villages are so big and generate so close to each other that they will merge into one big village. When they merge, generation bugs may appear. I have seen multiple times that gravel roads of village one will generate on top of houses of village two.
I've also seen a house cut in half by a farm.

If you want screenshots/seed/coordinates, just ask, I'll post.

How to reproduce: create a world with that preset and fly around a bit. They are relatively easy to find. To make them easier to find, you can increase the size (distance cannot be smaller than 9).