Continuity: While Mike is signing books, a fat guy bends over next to him. Angle keeps swapping in a matter of seconds from front to back angles and he's always there, except for a moment from the back when the guy disappears, only to appear again in the front angle.

Continuity: The cognac bottle magically refills itself after frozen Mike chats with his wife.

Continuity: Mike knocks down the china vases and boxes on the fire place, but they appear perfectly lined half a second later from a different angle.

Continuity: Before rain falls in the frozen room, Mike shields himself with his arm. In that brief moment the stains on the wall disappear.

Continuity: While Mike is presenting his book, the cigarette on his ear is semi-hidden by his hair. Half a second later the hair appears shorter and the cigarette is visible.

Continuity: When Mike falls from the air vent, the rug appears clean and brilliant. Half a second later, it is dusty and pale.

Continuity: The floor plan in room 1408 changes from white to black.

Continuity: In the scene Where Mike Eslin's hotel room has frozen over and he is laying on the floor talking into his recorder he notices his computer turns on and his wife is talking to him. As Mike tries to get up you see his head touch the alcohol bottle, in the next shot that is further away from Mike you see the bottle is much further away from his head then it should be.

Continuity: When Mike falls on the frozen floor, after chatting with his wife, the vase swaps from being covered in ice to semi covered between shots.

Plot hole: Time inside room 1408 moves differently than time outside it, as evidenced by the fact that Mike spends weeks or even months in what he thinks is his home in California, while in reality he is still "in" the room. The Hotel's manager states that no one has ever lasted more than an hour inside 1408. He goes on to cite many examples where the guests died after just a few minutes. No previously sane individual commits suicide after spending a few minutes in an eerie room, obviously, so the only explanation is the one offered by the "receptionist" over the phone, albeit in fewer words: guests in room 1408, while experiencing their own time frame inside the room, are in fact reliving the same hour over and over according to the rest of the world's time frame. This being the case, Mike's ex-wife should not have showed up at the climax since Mike's hour had just started over, undoing the call he placed to her earlier in the film but later in the hour. Whether or not the film makers intended this inference is irrelevant as the movie plainly lays out these conditions and must therefore adhere to them lest a plot hole be created. [This keeps being debated back and forth - ultimately there's not going to be any absolute resolution, so it's being locked down as a mistake and viewers will just have to make up their own minds - Jon.]