Other mistake: In the scene immediately after the opening credits, Jim is talking to Melinda on the phone. Right as he's hanging up, someone calls out "Dr. Clancy? Got a minute?", to which Jim waves in acknowledgement and starts up the stairs. (Jim's spirit has been in Sam Lucas' body since season 4 and in an earlier season 5 episode, his white coat is embroidered S. James Lucas, M.D). (00:09:15)
The One (2) - S1-E22
Other mistake: The captain talks about the "outflow valve", which has a distinctive rectangular shape and is fitted flush with an opening in the aircraft skin. It would be immediately recognizable by any crew member because it part of the walkaround inspection before each flight. He is holding a round pneumatic supply valve instead, which is part of the internal ductwork.
The One (2) - S1-E22
Other mistake: The tail and nose section of the crashed plane are from a 737, which has only a single axle on each landing gear. Landing gear with dual axles, from a much larger plane, can be seen in several scenes.
Other mistake: When Rick suggests that the ghost may have had multiple personality disorder and that's why he's appearing as different people, Melinda says this isn't possible, because when someone dies they're free from all afflictions they had when they were alive. In season 2 episode 4, "The Ghost Within", the featured ghost has autism and is not able to verbally communicate or make eye contact with Melinda and we never see him freed from this mental affliction.
Other mistake: The show was supposed to be on the East Coast, however you can see a reflection of a California Flag in Melinda's front windshield. (00:09:35)
Answer: This "spirit" appears in several episodes throughout the rest of the season including the season finale. He's a "bad spirit" that is intent on keeping souls trapped on Earth. With the death of Andrea (her business partner) he wanted to make a deal with Melinda, to give him HER soul to release everyone else including Andrea to cross over.
Boobra