Revealing mistake: In the underwater view of the fish, the ice hole is almost perfectly round and the ice appears to be quite thin - nowhere near the several inches Jason and Ben have to chip away to reach water. (00:33:55)
Continuity mistake: The wrapped Christmas presents set near the airplane's tail are stacked differently in the before and after views of Ben's arms in the storage compartment. The gold package that is on top is missing and the larger green package on the ground is angled away from the others. Later, the green package is aligned with and touching the lower gold package. (00:16:39)