In the scene where the wheel chair bound Vincent Price is giving a tour of his wax figures, there's one named Hemmler or Kemmler who's in an electric chair. I could swear that is Charles Bronson sitting there.
Of course at the end, there is a wax head of him at the police station. Earlier, as Sue is going through the dark museum, he pretends to be one of the heads on a long counter.
I could swear that is Charles Bronson sitting there.
In an earlier scene, Jarrod explains to his new partner that Igor (Bronson) tends to make all of the figures look like himself. But, in the case of Kemmler, Jarrod was humoring Igor, because, he said, Igor did bear a resemblance to Kemmler.
If there is any truth to Bronson actually resembling Kemmler, I do not know.