John Ensign at age 47 portrayed teenage Jimmy Walton?
John Ensign's IMDb page indicates that he was born on April the 6th 1917. Yes 1917! Or so IMDb says. This movie was released in 1964. Therefore Ensign would have to have been 47 when this movie was released. I detect there's gotta be an error somewhere because when I saw this film, John Ensign/Jimmy Walton didn't look anywhere over 20. So either IMDb made a mistake about his birthdate, or WOW!, that guy looked incredibly young for 47 and did a stupendous job of playing as a teenager.