Three/Four Musketeers: The Suit

TCM just showed The Three Musketeers and Ben Mankowitz mentioned in his exit comments that The Four Musketeers sequel was shot at the same time. since the cast wasn't told this and a second movie didn't net a second paycheck for them, they filed suit and won. this also resulted in "The Salkind Clause" which is a stipulation included in all movie contracts and states how many movies are going to be made from the filmed material.