As you can see in the picture above, Michael J. Fox barely clears that podium. In fact, the actor is 5 ft 4 in tall. Which is pretty standard for actors in 1980′s and explains how he never hit his head getting in and out of that DeLorean.
Due to a deficiency of the anterior pituitary gland, which produces growth hormone, Zelda Rubinstein stood just 4 feet 3 inches. She remarked that this caused a tough upbringing, but she ended up having the last laugh when she became the go-to awesome short lady in Hollywood.