You've not missed much. We covered what labour is, what interventions the hospital wants you to have (well, not worded like that), a tour of the birth suite and "breastfeeding is easy and natural, here's a doll to practice holding to your covered-up breast".

What you actually need to know, but aren't told:
To push, pretend it's the biggest poo in the world.
If you tell the people pushing interventions to go away and shut up, they have to. No one can give you drugs/surgery or take your baby away without consent. REMEMBER THIS - people will try to bully you by telling you otherwise.
If you're on a monitor, you can request the monitoring is stopped at any time. If someone ignores your request, rip the thing off yourself.
Breastfeeding is very hard at first - expect a problem or two. Get a decent advisor's phone number before the birth if you do have major problems. To some women it's easy, but for most of us it's a learned skill, like walking. Hard at first with a few bumps, but second nature after just a few weeks.
Yep!! What she said

I don't think I learnt a single thing at my classes that was any use to me at all during my labours.
I learnt alot more from online boards like this one with real women talking about what really happens in hospitals and in labour.
Do lots of reading here and you'll learn much more than you ever will at a hospital class - where as Ryn pointed out they only tell you what they want you to know anyway