- I echo what others have said in here that the film focuses so much on the Losers that Derry itself becomes almost a non-factor. One thing the book does insanely well is set the town itself up as a character in the narrative. Derry exists because of It, the town is the creature's killing field and It's influence is everywhere and in every resident. That whole element doesn't translate to the film whatsoever which is a shame. Derry could be anywhere, any small town in America because it loses it's personality in translation. Leaving out the destruction of the town at the end was a big part of that, it serves a very important narrative purpose in the book because it shows that It is really dead this time, It's influence has finally left the town and Derry collapses in on itself and starts to die as a result.
- Seriously, what was the point of Henry Bowers being in this movie? He's an extremely important character in the book (being almost as much of a threat to the Losers as Pennywise/It is at points) so I understand why they wanted to keep him in it, but his role just ended up feeling completely extraneous. When a side plot can be lifted from a movie completely without making a damn difference to the main story or the outcome, what really is the point of including it? As good as the actor was, all his story did was add to the run time and interrupt the flow of the main plot. They should have just said that he died following the events of the first film and was posthumously blamed for the child deaths and disappearances and been done with it.
- Related to the above, why on earth did they bother including the characters of Audra and Tom at the beginning of the film for neither of them to ever be mentioned again? Again, what was the point? The whole purpose of the characters being introduced in the adult part of the book (other than add to the characterisation of both Bill and Beverly) is that they end up becoming important to the plot later on, but that never happens here so including them again feels ultimately pointless. I must admit though, Eddie's wife being played by the same actress as his mother in the first film did give me a laugh though.

Eddie does admit to himself in the book that he's ended up marrying his mother, so it works.