Firestarter - S4-E1
Visible crew/equipment: When Eli is at McShay's bar he hears the ghost beside him say, "Day after day after day," then when the bartender speaks to Eli, in the wide shots the shadow of the boom mic is visible right above the mirror. After Melinda walks in, when the bartender tells her that Eli scared all his business away, we can see in the mirror's reflection the boom mic dipping into view.
Visible crew/equipment: When Melinda heads out to go on a run, while she and Sam/Jim are standing beside her car, in the shots facing Sam/Jim we see Jim's face, actor David Conrad, and in the car window's reflection we see Sam's face, actor Kenneth Mitchell, which is deliberate for viewers since Jim's spirit is in Sam's body. But just as Melinda says, "He worked a lot of weird hours, and liked to sleep-in a lot," it's amusing that in the reflection we can see both actors - David Conrad walking and then standing behind Kenneth Mitchell, both of whom play the same role and are wearing the same grey T-shirt.
Visible crew/equipment: After Sam/Jim tells Melinda that he'll be leaving and doesn't know how long he'll be gone, as he drives away the reflection of the large reflector screen can be seen on the pickup's vent window.
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