ive always imagined that test audiences believed it to be a prosthetic and therefore a deliberate creative choice by lars von trier. which is fucking hilarious, because it so thoroughly cheapens the serious arthouse themes he was playing with of like sex and nature and depression if you believe another theme he wanted to showcase was "and the guy has an absolutely monstrous hog"
The usual interpretation is the director was trying to move the plot along with things happening during the sex scenes, but the penis was so attention-grabbing that the audience missed the plot points, which made them struggle to follow the rest of the movie (be confused).
There are images on the internet of his penis. It's not "confusingly large," I don't think. He's just one of those guys that tends to hang large and low. A shower rather than a grower, as they say.
Off topic, but what's the source? And is this a physically valid walk cycle, or just an animation? The bit where the three feet are all in line looks pretty sketchy but it's potentially dynamically stable
Just like that. He has a designated guy who is his penis carrier that takes care of clearing the way in front of him and helps shoulder the weight. Especially around corners, which can get logistically tricky.