Looks like during the first sync it "Join"s your contacts with your Facebook friends. If it misses any or you add someone new you can Join them manually from the Facebook contact. Menu > edit > Menu > Join [edit - you can also find separate the same way - if any contacts get inappropriately joined]
Also from the main contacts Menu you can toggle friends with no phone numbers on and off.
K, back to it - enjoy
i'm having an issue where the phone synced up the wrong person to the person i put in my phone and it is confusing the crap out of me. Is there a way to remove choose the facebook profile i want to sync with the phone number?
they have the same name but it's pulling up the wrong photo/email/etc.