OK, I noticed this before, and went back to check before I posted. Watch the hotel scene in GB1, get to when Peter and Ray are talking on the radio and we hear Peter scream, pause and watch in slow motion or frame by frame when Ray is running down the hall and his back/proton pack is towards the camera (this will work best with a DVD), the back board/mother board is only a piece of peg board, not even wood! Of course wood is stronger, and the peg board may only be used in a section of the back board, but it is there non-the-less.