There are a few really...

go on about their ex
text other people
assume the guy will pay for the meal
mention other people they're dating...by name. (Mixes signals)
Introduce me to their family...

fart
make an ass of themselves in a public place

Be rude to the waiter/waitress.
Say that a woman looks slutty.
Ask how much money you earn.
Talk so much that you can't get a word in.
Say that they cannot stand silence (I'm a hardcore introvert).
Mention that they only enjoy vanilla sex.

-be constantly checking their phone
-express strong political beliefs that oppose mine
-not say much
-try to touch me inappropriately, or say inappropriate things