Corrected entry: Sam Jackson says that the whole hotel has magnetic key cards except room 1408, saying electronics don't work in that room. Yet there are working lights, TV, and radio in that room.
Corrected entry: During the scene when Mike notices the picture of the boat is crooked in the living room, he jumps over the couch to fix it. As the shot changes to look directly at him, you can see a reflection in the french doors behind him that looks like someone pulling a pillow off a bed. I waited for this to come into play in the plot, but it never did.