The music

Probably because it's the same composer who did this and HR 1 & 2

When you talk to God its called prayer...when God talks to you it's called schizophrenia...

Not only the music but plot also. Bartok acts à lot like Channard and just like him, he stole à gifted kid to get to his ends.
But it's no coïncidence, both movies came out back to back and both had some of the same composers, writers and special effects dudes working on them.