The funniest part about that 1956 card (aside from changing history to show 'The Mick' making the grab) is how Topps took the column of gentlemen on the far left of the original photograph, and also slotted them into the far right of the active area. I mean, they're freakin' looking the wrong way, for cripes sake!!!!
Conventional wisdom held that the intent was to fill some empty seats to add more excitement, but that doesn't really hold water. If you examine the picture by looking at how much of the shot above Mantle's mitt is in play on the card, you can see it would end just a touch above the necktied guy sitting down at right, which would include only a negligible amount of no-show seating. A better answer is the original photograph (assuming it hasn't been cropped over there) abruptly ends on the right side, so they needed to add space for the layout to work more effectively, and that was their quick solution...
1956ToppsMantlepiccrowd.jpg
When the image of those gents was repeated, they should have flipped it horizontally to literally get their heads in the game. Come on, Topps!!! Here is just a quick copy and paste...
1956ToppsMantlepiccrowdCORRECTED.jpg
Oh well.