User blog comment:IsaiahV17/Goosebumps 2 may have a new title/@comment-4207976-20171222210207/@comment-4207976-20171222224655

There's already a book titled "Slappy's Revenge". And I'm pretty sure the phrase "Slappy's Revenge" was used in the first film as a joke.

Also, I think I know why the title of the film changed. Since Jack Black is gone, they probably didn't think HorrorLand would would garner much interest on its own. So they included Slappy's name in the title instead.