Sometimes in my work I see points-liars of two kinds:
1. Point which seems to be smooth — the angle between it's handles is very close to 180 degrees — but actually it is not. I guess there could be a (very slow) script, which goes through all points in selected objects and convert those of them which have angle between handles fit within defined value and turn into real smooth.
2. Point which says it is smooth, but looks sharp. You really see the angle, the corner, but when you try to tweak a handle of one of these, the opposite handle instantly remembers it's smooth and moves symmetrically, as a smooth point should. The problem is you can't always check every point's status in Control palette before tweaking! I'd like to have a script which I will conjure for every suspicious path and get rid of these little bastards.