In Writing with Hitchcock (2001), Steven DeRosa noted that Hitchcock supervised them through every draft, asking that they tell the story visually. He told Roger Ebert in 1969: Once the screenplay is finished, I'd just as soon not make the film at all.
A drop kick is a type of kick in various codes of football. It involves a player dropping the ball and then kicking it when it bounces off the ground.
Foot drop, or drop foot as it may also be called, refers to a weakening of the muscles that allow one to flex the ankle and toes, causing the individual to drag the front of the foot while walking and to compensate for this scuffle by bending the knee to lift the foot higher than usual.