Continuity: When Mike first enters room 1408, there are three light switches on the wall. He flicks on two of them. A few seconds later, you see the switches behind him, but it is two different switches that have been flicked.
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As Mike scrolls through the microfilm, we see his view as the pages scroll from right to left. The shot then reverses to show his face through the scrolling film, but while the film is now properly reversed, it's still moving right to left in our view. But this reversed angle should show it moving left to right. See more...
1408 mistakes
Continuity: After slamming his hand in the window, Mike bangs on the front door leaving blood on the left side of the map on the door. Later in the film, there is blood on both sides.
Continuity: When Mike opens the laptop, the screen is folded slightly backwards, in the following shots its positioned in a straight angle.