As it relates to the cardboard, I'm kinda cheating since I'm about to highlight two different parallels of one of my favorite player's rookie cards. I've had these tucked away in my collection for a few months now so there's no better time to show them off.
As any modern-day collector knows, there are typically 20-30 different RCs to chase of any given player. However, this is one of only two official RCs featuring Motter. That makes it easier for a player collector to go parallel hunting. Though you can't tell from the scan, the card on the left is the reverse stock version. These flip the finish from a 'normal' card. The front is rough and has a flat finish to it, whereas the back is smooth and slightly glossy. On the right, we have the red back version. These aren't serial numbered, but they have a reported print run of 10 copies. For what it's worth, I'm still looking for the far more common gum-stained back. If anyone reading happens to have one, I'd love to trade for it. Thanks for reading.