Goofs

10:58 Sam says they have to loose weight or they are going down, so he starts throwing stuff out of the trunk that is floating next to the raft. The raft is completely separate from the raft and is not adding any weight to it. In fact it could be adding buoyancy because it is floating.

The ripples and shadows in the ocean horizon backdrop are plainly visible in nearly every shot.

When Sam and Vanessa are eating by the fire, they look up at the stars and see Venus in a black night sky. However, on the ground, it appears to be daylight, or at least evening light, as everything is well lit, even far from their campfire.

The moon's reflection shifts during the dinner scene.