Dean talks to Maggie about why she's still filming and she says it makes her feel better. Later, after getting Sam back, Sam goes to ask the same thing and Dean says it makes her feel better. The problem is, the one filming at that time is Spruce.
One of the Ghostfacers at the beginning says he's 15/16th Jew. Jewish is not a race. It's a religion. You practice whatever religion you choose/believe in. It's not something you are physically.
The episode is supposed to take place at night, yet several scenes have sunlight shining through the windows.
Some of the camera angles where "Maggie" is supposed to be holding the camera are wrong. She's shorter than any of the guys and during cutaways we can see she's holding the camera at about the level of her own chin, but her camera's footage shows it's clearly being held on the shoulder of a cameraman who is taller than "Ed" and "Harry".
When Dean and Sam approach Ed and company in the house they mention the job in "West Texas". The job was in Richardson, a suburb of Dallas in the North Central Texas area. There is a West, Texas in the central area of the state. It's a long way from Richardson to west Texas.
An electromagnet that can erase videotapes and hard drives from more than a few inches away would be too large for Dean to carry in a backpack. In addition, it would require much more power than a few D batteries, would take more than a few minutes to erase the data, and would be potentially dangerous to people in the same room.
About the middle of the episode, when Corbett has been taken by the ghost, Ed is freaking out and, while he is obviously talking about him, says a wrong name : "Come on guys,this is ridiculous. How the hell is this supposed to find Corben"