The way corpse falls in front of Carol isn't right given it's previous
position on the chair.
There is no way they wouldn't see Maggie's being dragged right next to them when they notice the boat is on the sea.
Laughably obvious false head of Ashab.
When corpse falls in front of Carol, it's all rotten, but in the previous shot you could clearly see healthy skin on it's hands.
When Julie discovers corpses in the room, one of it still has eyes despite being rotten.
Obvious make up/mask on the killer.
Obvious fake skin/flesh for wound when man is bitten and killed in front of the French girl.
When Julie confirms that she wouldn't have met them when they talk about the islands before going on a boat, her mouth doesn't move while saying "right".