Revealing mistake: When Jake "kills" Chelsea, and his phone starts to ring, the phone is blinking, and vibrating. It falls to the floor, and Jake reaches for it, when he does this you can see that the phone is not actually ringing, because the screen is dark and the screensaver is active.
Plot hole: The Hellworld website at the beginning of the film has eerie music and also Pinhead's voice reciting some of his famous lines from other Hellraiser movies, which is impossible; there's no way that someone could have gotten recordings of those moments in the past where he said the lines, so they couldn't be playing on an internet webpage.
Question: Are open-throated Allison and the mutilated dark-haired guy near the end chasing Chelsey supposed to have become cenobites? Because they seem to be animated after death like the cenobites but they aren't wearing the usual leather gear and apart from their mutilations they look otherwise human.