Every time Jack Torrance talks to a ghost, there’s a mirror in the scene, except in the food locker scene. This is because in the food locker scene he only talks to Grady through the door. We never see Grady in this scene.

Continuity Polaroid of actor Danny Lloyd on the Guest Room Hallway set of The Shining.
(photo courtesy Filippo Ulivieri, who has written an Italian biography of Kubrick’s longtime personal assistant Emilio D’Alessandro)

Countdown to Halloween → The Shining (1980)
You’ve always been the caretaker. I should know sir, I’ve always been here.

