If you think about it, the wiggly cane is indeed sensible. For the effect to work, the figure needs to stand perfectly still. I assume they had a blacklight trained on his face, and so his head couldn't move, neither his body. Well, pthhh, they can't just have a frozen mannequin standing there! They need some animation to bring the figure to life. If you think about it, about the only thing that can move is the cane arm, so that's what they did. The eye immediately focuses on motion, so it's not surprising that this is what I first noticed and have the clearest memory of.