'I'll tear this film apart!'
By listing the problems I have with it...
The doctor had very little character development for me. It never explained how he got those boxes or his desires to go into hell. For a lot of his screentime he never spoke and just looked around in curiosity. And now we're suddenly meant to take him seriously once he becomes this evil monster?
A rather poor demise for Julia. It just got windy all of a sudden and the next thing you know she's blown out of her skin never to be seen of again. Thought they'd have given her a better sending off than that.
Kirsty changing into Julia's skin is of course ridiculous. The fact she fits into it perfectly in the time it took her to do so without the doctor knowing. Not to mention her plan of saving Tiffany hinged on the doctor reacting in that way to her dressed as Julia. It's lucky the doctor didn't kill her due to Julia's betrayal huh?
How is it Kirsty is always so wise to these things anyway? She even knew that photo was of Pinhead? That could have been anyone!
I'm sure there are other things but on the whole it's pretty inconsistent.