Revealing mistake: When the bridge blows up, there are explosions on the bridge deck itself, but the charges were only set on the pillars below.
Revealing mistake: Allison is wounded by a grenade fragment while disabling the Japanese 105's. But when his bloody shoulder is first seen, the blood stain is visibly too bright for real blood.
Revealing mistake: A blank firing adaptor (BFA) is visible on the muzzle as the men set up the .30 caliber machinegun.