When Mrs. Howell is speaking to Ramoo outside the cave where they have been jailed, the spear in his hands is originally stretched across her body, blocking her from leaving. In subsequent shots of close-ups & long shots the head of the spear changes position as does Ramoo's hands.
When Kincaid is chasing Gilligan & Gilligan falls into the water trough, he is seen to fall in backwards with his head to the far end, left of the screen. When Kincaid comes to retrieve him from the trough, Gilligan is now seen reaching up to grab Kinkaid's arm & pull him into the water & jump out. But Gilligan is facing the opposite direction.
Ramoo draws a target on the tree but as he walks away the drawing changes.
In the opening sequence, when Gilligan runs from the lagoon & comes to the clearing, where he meets Kincaid, in the long shot he is seen to trip over a patch of moss. As he struggles to maintain his balance, his feet are heard to strike the ground & echo as if striking a hard surface. This is unusual for the fact that they are supposed to be on sand & Gilligan is wearing sneakers.
It is unclear why Kincaid flew to the island. An experienced hunter like him would know there is no natural way for big game to be there.