I was just watching a clip of Bart Starr's game-winning quarterback sneak in the Ice Bowl. One thing I noticed is that the goal post stanchion is inside the end zone, not behind the end zone as it is nowadays. That must have been interesting back then, with receivers and defensive backs possibly colliding with the stanchion if they weren't paying attention, or receivers using the stanchion as a screen.
Anyway, when did the NFL move the stanchion outside of the end zone?