Visible crew/equipment: In the scene just after the train dodge attempt by Teddy, you can see something white hanging out of Vern's pants as he walks onto the tracks. It is probably some part of equipment for his mike. (00:17:50)
Visible crew/equipment: Part of a fluffy boom mike is visible at the top of the screen when they are arguing about crossing the bridge. [Edited in DVD]
Visible crew/equipment: A reflection of a camera tripod can be seen in Teddy's glasses when Teddy and Chris are arguing on the railroad tracks.
Visible crew/equipment: There is a boom mike clearly visible in the billiard scene. [Edited in DVD]
Visible crew/equipment: In a bird's eye view when the boys cross the bridge, there is a camera visible at the end of the bridge.
Answer: A cello.