The narration was not necessary
I personally felt it was too out of place.
I can imagine if they were much closer to the book for it to be there. But this is not a book this is a film.
There is a lot of plot holes in this film.
Corey mentions to Gary Busey in the car that it could be a werewolf, but there was never any development prior to set this up.
It would of been more convincing if we saw Corey Haim read some werewolf comics or watch a wolf movie in a sequence but it was so left field and came with no development too.
What happened to Brady's father? The last time we saw him was in a nightmare. That sub plot vanished.
I really would have appreciated an epilogue, maybe showing the family coming back and maybe showing Corey Haim's character die to justify the narration, otherwise the narration becomes too Hallmark and out of place.
A lot of plot holes, underdeveloped characters, and overall a mess of a script.
Now this considering I never read the book, but I just would of liked it to be a bit more coherent.