Towards the end of the episode, when Mulder & Scully are standing next to the car talking to Lucy who is sitting in the car with the door open, you can see (I assume) Chris Carter and a cameraman in the reflection of the car window.
When the tow truck driver gives the location where he tried to help Carl Wade on the side of the road, Mulder identifies the position using Interstate 12 and Highway 903 on the map. However, Interstate 12 is not near the setting of the Seattle, Washington region. It is located entirely in South Louisiana.