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. Football has hitting, clipping, spearing, piling on, personal fouls, late hitting and unnecessary roughness.
Baseball has the sacrifice.
Baseball has a 7th inning stretch. Football has a '2 minute' warning. Baseball has no time limit, we don't know when it's going to end. We might have extra innings. Football is rigidly timed, and it will end even if we have to go to 'sudden death'.