Melissa,
Sounds like you are having a great time!
As far as what the RC said, I think not being invited back because "you did something really bad" was a poor choice of words. Very often houses only cut for grades after round one, but that is not always true. Perhaps in the past houses did make severe cuts early on (which usually lends itself to many PNMs going to only a few parties and thus, rush not working out too well for a lot of girls). But perhaps they have evaluated that and realized they should invite more PNMs back to get to know them even better. Let's face it, it's pretty hard to get to know someone in 30 minutes!
So maybe that's what the RC was refering to, that most houses wouldn't be cutting too much after Round 1. But again, I'm only speculating!
Also, we have another thread going on about whether its's better to see your ivites before you decide on a house and all I have to add is this: when you see that list, if "Jane's" house does invite you back, please do not keep them and drop a house you truly feel you would be a better fit in simply because "Jane's" house is the IT house. Go with your heart, it won't steer you wrong!
Good luck and keep smiling!!!