I am sorry, but I will only give vague answers :-p
1. It is a little Joke and a fan-thing on the one hand. On the other hand: there are many connections between my story and IT. My spider represents something different than the spider in IT, but it is also not pleasant. ;-)
2. She got killed.
3. The Shining and Lost Highway can give the answer. :-)
4. I think the short film gives the answer.
5. The number has a trivial and a more symbolic meaning.
I really don’t want to be too artsy fartsy, but to be honest I love stories that are a bit ambiguous and I think they only stay interesting as long as the author doesn’t explain too much! :-D
Thank you for your interpretations!!!