Checklists were always so boooooring before Upper Deck came along and turned them into actual cards. I'm really not sure why companies included them to begin with, though I guess I'm just young enough to not really know how card collecting used to be before the internet. Nowadays, checklists in packs are absolutely pointless because their so readily available online.
But back in the day, if you were trying to figure out the missing cards from your Mets team set, you'd need this little guy:
A sketch on top of a sketch of Darryl Strawberry! It's nice to get a break from the typical Darryl action shot, this one being of him running the bases. There's nothing exciting at all about the back (other than the complete list of Mets in '89 Upper Deck, obviously)... you get the depicted player's name (some weren't so obvious), the team logo, name, and the list of players. 23 players in all... talk about inclusive.