Children don't get to an age where it's suddenly the right time to bring up subjects like gender stereotyping, consent, equality. These things need to be a part of their everyday conversations from day one.
As an early years practitioner, you talk to babies and let them know you're going to change their nappies. As they get older, you seek their consent to hold them, dress them, etc. You teach them about personal space, only hugging someone who welcomes it, etc. You also talk about what's happening in books; what people might be feeling, why they are doing things, whether those things are OK. It's just an integral part of working with small children.
The conversations change as the children mature so that they are equipped to understand bodily autonomy and consent in age appropriate ways at all times. There are good reasons behind this.
It's perfectly appropriate to have these conversations with children younger than five and they can be triggered by films, stories, pictures, toys or anything else they come across that seems appropriate in those specific circumstances. It doesn't need to suck the joy out of anything.
I agree that the OP doesn't need to contact the teacher about this but that's because I'm damned sure the teacher has this angle covered already as part of his or her planning. If it isn't covered, it will be in some other way and the OP can cover it with her own child at home.
Nobody has to say that the prince shouldn't kiss sleeping beauty. The point is that you're having a conversation, exchanging views and creating opportunities for critical thinking. It's completely appropriate to conclude that he was perfectly lovely for waking her up that way.