In the scene where Sam's grandfather falls into a hole in the ice somewhere near the 'Arctic Circle', as he is staring at the just discovered, frozen Megatron, there is a fire burning below him on Megatron's arm. Megatron has supposedly been buried/frozen there for a very long time so how is he on fire? I suspect there may be a 'deleted scene' that might explain the fire, but this should really have been edited out.