Hmm. I've made it a point to eat something for breakfast for the past year or so after very rarely having eaten breakfast in the past and IME that bowl of cereal and cup of coffee makes me actually eat less total in the day. I used to get really, really hungry around lunchtime and that's pretty much always a bad idea because when you're hungry you make worse decisions. Well, at least I do. I will say that if you're going to miss a meal, it's better to miss one of the later ones than the first one, at least in terms of being able to more easily control what you eat throughout the day.
Everybody's body is different though, so YMMV.
For other myths, stretching's a big one. I know there's that idea that you should stretch out really heavily before and after every workout but in reality overstretching can actually cause damage in and of itself. I'd love for someone with more fitness experience to expound upon that though.