In baseball the team is run by a manager who wears the same uniform as the players. Baseball begins in the spring, the season of new life. Football begins in the fall, when everything is dying. In football you wear a helmet. In baseball you wear a cap.
Football is concerned with downs.
In baseball, you're concerned with ups. In football you receive a penalty. In baseball you make an error. In football the specialist comes in to kick. In baseball he comes in to relieve someone.