An elderly woman who lived in one of the houses near where the marketplace scenes were shot, once stepped out into it with a shopping bag and, even though director Werner Herzog told her it was just a movie set, insisted on shopping and interrupted the shoot for 15 minutes.
Herzog claimed that if a character was giving a speech to a crowd of people, he would place a suitably-sized crowd there, even though they would not be seen by the camera, claiming, "You can't fake addressing a crowd of people that large."
After two minutes of the hypnosis scene, the cinematographer started to weave and his head sunk back. Herzog grabbed him and put him softly back to the camera where he continued. Not only that, but Roth was actually able to hypnotize the young woman as well, again Herzog stating that one "cannot act waking up from hypnosis" like we see in the film.