Question: Whatever happened to Ash's chainsaw? Surely he wouldn't be such an idiot to leave it in the shack where he made sushi out of Bad Ash.
Answer: Towards the end of the film, when Ash mounts his horse and rides off into the sunset (before it then cuts to present day and he's back at the S-Mart), you can see his chainsaw is strapped to the horse's saddle. It seems that he either recovered it after the battle or perhaps he sent someone to the windmill to retrieve it.
Answer: It most likely ran out of gas or broke down.
Answer: Yes, I recall a college friend being shocked to see his textbook on screen.
Brian Katcher