Continuity mistake: When Quinn and Robin are flying off the island in the DeHavilland Beaver, after replacing the Wheels with Japanese WWII floats found on the island, you can clearly see the brace wires in between the floats. These wires shouldn't be there, since they used bamboo to attach and brace the floats.
Continuity mistake: When Angelica is first approaching the charter plane, she has two bags - a leopard print bag and a white bag. Two shots later where she is sitting down in the co-pilot's seat, she only has the white bag. When she gets off the plane on the resort island, she has only the leopard print bag.
Continuity mistake: When Quinn and Robin first escape the pirates just after they row back to the island, they run up a hill for quite a bit. In a later shot they are running along a path close to the seashore, but immediately following that, they are at the higher elevation again as the pirates catch up to them.