When Jake opens the notebook to pick a monster, he rips off the first page, while he rips it you can see the monsters he has written. Some of them are Wraith, Banshee, Flying Spaghetti, Vampire and when he is going through them to pick one, it has changed to Wraith, Skinwalker, Vampire. Banshee and Spaghetti have been replaced by Skinwalker.
When Jake is reading the notebook to pick a monster, Wendigo has been written twice. Once between Scarecrow and Poltergeist and then again between Masked Killer and Mummy.