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LOL, for such a popular series, we sure are nitpicking a lot of details out of it (although rightfully so, some of these things does make you /boggle after a while). Seriously, I wish more hot girls in real life were into emo dudes the way they are in these games (particularly FFVIII, if I recall, Squall was quite emo).
Regarding the Tifa stuff:
Spoiler:
You actually can woo Tifa in the game, through minute ways. But it largely involved ignoring Aeris (that's what the US version called her, that's what I'm going to call her ), and giving more attention to Tifa, like giving Tifa the flower you buy from Aeris, and mentioning her a lot more than Aeris during conversations, so that when it comes time for the Gold Saucer stuff, Tifa joins you instead of Aeris.
But the sucky thing about this is that the storyline is so focused on Aeris that it feels almost tacked on, and Cloud still ultimately treats Tifa like shit for the most part, so you're better off just focusing on Aeris.
I can't think of anything specific atm (that hasn't already been talked about, particularly Final Fantasy stuff), but if I do I'll post it here. Interesting post though, talking about stupid stuff that characters do which seems to defy all logic for no really good reason either, other than to force some storyline to go forward.