But to answer the original posters questions:
1.unusually bad breath…you shouldn’t be that close, although dry mouth could be a sign of nerves
2.wrinkled clothing…only if there’s a reason. ie.raining or from sitting in the car too long
3.laughing too loudly in public…some people call that bubbly and that would depend if what you said warranted a good laugh
4.acting bored in your presence…you won’t get the chance to say no, the bored one will probably beat you to it.
5.chewing bubble gum on a date…any gum is bad
None of these are bad enough to look back in a few years, if you’re still single, and think back about the ones you let go for stupid reasons.