Visible crew/equipment: Throughout the movie, in the shots of the guys on the alien planet, the white reflector screens and film crew's reflections are visible in their sunglasses. (00:40:20)
Visible crew/equipment: During the final revolt against Ra and his warriors, you are able to see that Ra's warriors are swinging rubber staffs as they fight the indigenous people.
Visible crew/equipment: When Ra's death gliders are sent out to attack the city of the native people, you can see wires guiding the glider models as they swoop toward the camera. (01:20:20)
Chosen answer: When Ra saw the bomb, he realised that it was a few seconds away from detonation. There wouldn't have been enough time to send it back.