Somethings Missing with Continuity
First off, I really like this movie. That said, there is something that seems out of place that could have been handled differently.
In the beginning of the movie the main character, Mike Enslin (John Cusack), tells the audience that he's a good researcher, investigating the paranormal with an EMF Meter, Full Range Spectrometer, and Infrared Camera. They show him using the meter in the first hotel he visits, but not any cameras. Then, they never show or discuss these objects again.
When he is in Room 1408, he has a bag which contains a (now old) cell phone, a laptop with webcam, a flashlight and a knife. Wheres his "ghost hunting" equipment, and why does he use a tape recorder if he has expensive cameras? He never takes a single picture of the places he visits!? You would think after the hotel managers speech, he would have brought out all possible equipment.
The hotel manager said electronics don't work in the room, but everything worked fine except when the laptop got wet. It would have been interesting if they had shown his EMF Meter going haywire. Or maybe, he could have a camera that showed him casually sleeping in bed, or some other visions. If you're going to introduce these items, at least show them even if they are not "working"!
My conclusion is that his EMF Meter doesn't actually do anything, and his line about the Spectrometer and Infrared Camera was a lie to entice his readers. The idea of having an actual Full Range Spectrometer without a Proton Pack makes him look amateur, so that's a pretty weak/cheap tactic.
The webcam to his wife was obviously to reconnect them, but he said he had no plans of contacting his wife. And he carried the knife into the air vent, but didn't use it when he was confronted by death. Was the knife intended for defense, or does he just use that when he can't find a toothpick?
Still a fun movie!