When Leo 'Transport' Andreof arrives in the jeep, he is wearing Staff Sgt stripes, but when he enters the building, he is now wearing Sgt stripes.
When one of the subs is being attacked by 3 Japanese planes dropping depth charges, the planes shown dropping the depth charges appear to be American F4F Wildcats.
When three Japanese try to surrender and then ambush the Marines, one of the Marines returns fire. He is using a M-1 Garand rifle, which only holds eight rounds. He fires at least 12 shots.
When the sub is being attacked by the three Japanese fighters at the 46:09 mark: The fighters are actually American planes, and the planes launch torpedoes into the water. But at the 46:36 mark and later, you can plainly see depth charges.
Two Marines use a road roller to attack a Japanese position, their means of starting it (spinning the flywheel) and the sound effects that follow strongly imply it is an internal combustion roller. Yet the chimney/smokestack is clearly visible at the front as well as smoke coming out that show it is actually a steam roller.
U.S.S. Nautilus and U.S.S. Argonaut were the submarines used in the Makin Island raid. Both subs mounted two deck guns and, due to their size, could not be mistaken for Gato class subs. The Nautilus carried 6" deck guns and were used to shell shipping in the harbor at Makin.
The U.S. Marines were not issued Garand semi-automatic rifles in wide numbers until after the Guadalcanal invasion, so it might be thought that the Raiders would have been using M1903 Springfield bolt-action rifles in the Makin raid in August, 1942, which happened as the Guadalcanal campaign began. However, as James Roosevelt, the President's son, was a member of the raiding party, the 2nd Marine Raider Battalion, the unit in the raid, were issued the most up-to-date weaponry, which included Garands; the Makin raid was, in fact, one of the first combat deployments of the M1.