Where did he go for the 4 weeks since he was rescued?
When the barge ship finally found him he was skinny, he was sunburned and brown, weak, and his hair was bleached blonde from the sun.
Then we see him on a plane going back home looking better than he did prior to his ordeal. The caption said it was only four weeks later. How did he gain all the weight back, and turn fair again, his hair is suddenly black again, and he actually looks better now than he did before the plane crashed! What happened to all that sun damage? It wouldn't disappear in four weeks!
And where was he staying in those four weeks and why? Why not get home right away?