As the barefoot Mr. Allison is walking through the first shack on the island, his shoes are tied together and hanging around his neck but the sound is of shod feet walking on the floor boards of the shack.
At the beginning of the movie, Cpl. Allison's raft nears the island. He slowly looks over the edge of the raft and sees the island, his hair quite disheveled. The next shot (and a few subsequent others in the same scene) show his hair much shorter. The remainder of the movie shows his hair at the longer length.
When the Japanese soldier returns to bottle of sake to the sack of rice, the bottle is almost empty, or about one quarter full. But when Sister Angela later finds the bottle in the rice sack, the bottle is almost full.
At the beginning of the film, Corporal Allison's raft nears the island. As he looks over the edge of the raft and sees the island, his disheveled hair is dry as well as his shirt. However, the next shot shows his hair much shorter but soaking wet as is his shirt.
When Allison approaches the island and crawls ashore, the camera shot from the raft shows him at the water's edge. However, when the camera angle changes to a view from the island, he suddenly is much further up the beach and away from the water.
Sister Angela asks Cpl. Allison why the Japanese are combing the island, and he says that they must have found the body. She asks him, "What body?", and he replies, "The one with his throat cut". Cpl. Allison killed the man by stabbing him in the chest, not by cutting his throat.
While in the cave during the Navy shelling, Allison says the four Japanese 105's are "hid real good". In fact, as is clear when Allison takes action against the "big rifles," they are quite exposed, without overhead protection, and would be highly vulnerable to the shelling, although hard to see from aircraft due to the camouflage netting (which had been blown away at one site). The Navy would have concentrated its preparatory fire on the landing beach, where the 105's were, although there would have been no assurance all could have been knocked out.