And I also disagree that he has his binders on. Watch ESB carefully again. The Ugnaughts come over to Han just before he is put in. Now as far as I can see, there is NO shot after that with the binders on. Therefore, it is from a "certain point of view" as to whether the binders remain on and we have a continuity mistake or he simply kept his arms down without the binders on. He did tell Chewie after all not to fight, so why would he (assuming the binders are off before freezing)?