User blog comment:BlouseGirl/Funny facts about Frozen/@comment-61573-20140808102453/@comment-61573-20140808234145

Actually, straight hair is no easier to animate. I have no idea if this principle still applies, as this was from a CGI film that predates Frozen.

I was listening to the DVD commentary of The Incredibles and when it gets to a certain scene, they mention the two most complicated things to do in CGI. The first is hair. The second is having characters make physical contact. The reason they brought this up? It was the scene where Mrs Incredible pushes Violet's hair back so we can see her face! They said when they found out this scene was in the movie, there was a moment of complete mental shock/paralysis!

Violet has long straight hair and if that was hard to animate properly, I guess that means it's not any easier then styled hair.