The whole aeris death scene was screwed up because apparently she wasn't meant to die at the Ancient City/at all. Some theories state Square originally meant for her to disappear without a trace, to be kidnapped by Sephiroth, merged into Sephiroth, etc. Her death at the Ancient City wasn't the original idea it seems...

Anyway, watch when Sephy's coming to meat cleave Aeris...first the floor has a black-and-white tile pattern, in the scene where he's about to stab her the floor is plain stone...har har har...watch her death scene carefully it is so riddled with errors and contradictions, Square couldn't POSSIBLY have overlooked them all if they meant it to be one scene!

As for spelling errors...well, the translators should've been fired in my opinion. I've never seen such a badly translated game...although they did the slang for Cid and Barret pretty well. And the 1000000 @#$%'s Cid uses, lol