Kowalski tosses an object towards the door of the compartment on the sub where the time bridge is located in order to show the crew that a force field is protecting the entrance. The object explodes, and the door is disfigured with a large square-shaped powder burst scar in the center of the door. Later, Chip returns and tests to see if the force field is still activated by tossing a silver dollar at the door. In this scene, the door is in pristine condition showing no scars. His test now creates the only burst-like scar on the door now located in the upper right corner.
After the Captain crosses the time bridge and meets up with Chief, the Captain uses the small round portable light to blind the two warriors who are approaching him. However, the warriors are standing beside each other so that in order to blind both of them simultaneously, the beam is configured in a wide rectangular shape which is impossible to be emanating from the small round lens. In fact, the real small round light beam can then be seen flashing across the wall at the back of the set while the captain is freezing the two warriors and attempting to maneuver around them while they are immobilized.