[Drawing error] Vampire Knight

[ErixSan]

This is a simple question: How is called this type of animation error?
(It's also when a bad drawing happens, like in this pic)

Edit: I found another one:

 

[18]

Don't you dare say my beloved Vampire Knight has animation errors

 

[ErixSan]

Don't you dare say my beloved Vampire Knight has animation errors

I loving the anime (but for reason Twilight closed my mind ¬¬)
I watched the first season and those are the only one I found.

Just want to know how are they called. (Because they have a name)

For example, those are another type of anime error (taking as example Pokémon)
http://bulbapedia.bulbagarden.net/wiki/Anime_move_errors