गूफ़

When Corporal Dalton first reports to Sgt. Gammon, the weather in the background changes several times between shots.

When Cpl. John Dalton is drinking champagne with Sgt. Gammon, his glass is always half full from the side view and empty from the front view.

A tank's gunbarrel cannot depress low enough to fire at the ground that close to itself - and in any case, the barrel was raised, not lowered.