For if no one has reported it yet:
In the Gold Saucer's Speed Square, ask to see your high scores. It displays an empty box.
EDIT: This is on Disc 2, by the way.
UPDATE: New one (may not be an error): Try using the wrong limit break item on Tifa. She says, "I've got the wrong person." This is assuming the characters are speaking in these occurrences. If that is true, it should be "Got the wrong person.", "You've got the wrong person.", or "I'm the wrong person." That's what I suppose, anyway.
UPDATE: Another error. After Carry Armor, Cid's line (should you have him with you) is a little truncated. "We'll just have to take it from 'e" I think it says.