I think that it's an advice for children to be self confident and trust in whom they are. I had been very impressed by little Rapunzel saying NO! to her bad 'mum' when she wants to take her with her.
Also it shows partly that love isn't always perfect. When Rapunzel gives Eugene the crown back she thinks that he runs away and leaves her behind and she's very sad about that but in the end both come together again.
All in all I think the film is very good and not only something for little children but for old man like my dad :D
5♥ of 5♥