List of twist endings

In The Books
Welcome to Dead House: Amanda sees a new family moving in as she swears to see Mr. Dawes standing at the front of the house.

Stay Out of The Basement: After she thinks her real dad is back, Margaret finds a patch of flowers claiming to be her real father.

Monster Blood: After defeating Sarabeth and the Monster Blood, The kids find that the carpet that the Monster Blood was on has vanished.

Say Cheese and Die: The bullies find the place where Greg and Shari left the camera and take a picture.

The Curse of The Mummy's Tomb:

Let's Get Invisible:

Night of the Living Dummy: After the Girls defeat Mr. Wood, they go inside to find that Slappy is also alive and was just waiting for "that other guy to get lost."

The Girl Who Cried Monster:

TV Show
The Girl Who Cried Monster: Same as Book