I can't stand when people ask if they're invited to my wedding. What kind of question is that? It makes me feel so awkward and I feel obligated to say that we haven't put together a guest list yet, even though we have. Don't ask if you are invited to somebodies wedding and don't say "I better be invited!" It puts the bride in an awkward position!
Next, if you are in the bridal party, don't complain about your dress. It is NOT your day! When your day comes, you'll have a chance to put your bridesmaids in whatever you please, so wait for that day and let the bride have hers. There is a distinct line between wanting to help plan and being demanding. After all, I'm not going to put you in something absolutely hideous considering you'll be in a large amount of the photos!