Jack appearing behind a door has a 1/2000 chance of happening. If you enter this room you will get jumpscared by Jack then are greeted with dotted red floors as a deception of blood. Rush, Ambush, Eyes cannot appear in the Red Room.
Shadow is a harmless entity that only scares the player for 0.5 seconds. This has a 1/? chance of happening after you encounter Glitch.
Window can sometimes appear outside of a window in the Hotel. This has a very rare chance of happening though.