The rifle that the radio man has on the beach changes appearance between shots.
As Davis walks along the track he gets caught by a loose branch around his boot. After disentangling himself, he asks Brodie how far away the plane is. Brodie informs him that it is about a kilometer away, and they won't make it before dark. At this point Brodie's jacket buttons are on the left side of his jacket. Cut back to Davis, who says they will make it. When the camera cuts back to Brodie, his jacket buttons are now on the right side of his jacket. The shot is in reverse.
When the pilot goes to get water from the stream and puts the empty container under water, he gets startled by a noise behind him and takes the container out of the water, still empty. In the next shot, it is full.
When the cave explodes, you can see that it is a stuntman jumping out, not Ron Perlman.
During the scene in the watchtower when the team are preparing for the next fight with the baboons, Brodie tells everyone not to shoot unless they get a kill shot because they are low on ammunition. In the ensuing gunfight all the team fire at the walls without getting kill shots and only killing a few baboons, because of this they have run out of ammo and cannot fight the next wave easily. If the team followed Brodies advice they would probably have had enough ammunition to fight all of the baboons.