While Jack is comforting Wendy in bed, we are looking over his shoulder and his right hand is on her right shoulder. The camera angle changes to Wendy's side of the bed and we see Jack's hand now on Wendy's left shoulder. The camera angle switches back and Jack's hand is on her right shoulder, and the angle changes again to Wendy's side of the bed - now Jack's right hand is on Wendy's waist.
When Jack goes to the shed to look at the Snow-machine, just after he picks up the note, you can see the arm of a winter jacket of a crew member on the right part of the screen. You can also see the boot of the crew member at the bottom of the screen.
Near the end of the movie where Jack is increasing the steam pressure on the boiler, he is increasing the pressure by turning the valve clockwise. This would decrease/shut off the pressure, not increase it. Turning the valve counter clockwise would increase the steam.
When Jack photographs the wasps in Danny's room, the flash does not appear as it did while photographing Danny and Wendy's stung areas on their bodies a few moments ago. This type of camera did not have an "on/off" flash option. (Part I)
In several outdoor scenes, it is snowing and there are large amounts of snow on the ground and trees in the foreground, but no snow on the roof of the Overlook Hotel, or on the trees and mountains in the background.
Near the end of the movie, Jack smashes a mirror with the mallet and starts walking towards the camera down the hall. After he takes a couple of steps with the camera pulling back. A table with flowers comes into view. The flowers are moving, likely disturbed from the camera crew as they were backtracking down the hall.