Vincent Price appeared as the Duke of Clarence in the Universal Pictures version of the film.

According to producer Gene Corman, he and his brother, director Roger Corman, considered leaving the production several times due to the cost cutting measures forced on them by uncredited executive producer Edward Small.

The Battle of Bosworth is made up of stock footage from the original Universal version of Tower of London.

The original tag line "Do you have the courage to spend 83 minutes in the Tower of London?" was slightly off, since the film's running time was only 79 minutes.

This feature was planned for filming in color. On the Thursday before the Monday start of principle photography, uncredited executive producer Edward Small informed producer Gene Corman that it was going to be shot in black and white.