I just spent an hour writing up a complaint about this set before I saw this forum post. It's ludicrous to have a checklist for the Stickerbacks and all their possible stickers, AND a checklist for the stickers with all their possible Stickerbacks. It's redundant and you end up counting the same card twice.
Topps did this for three years, 1988, 1989, and 1990. The 1989 and 1990 sticker checklists (on TCDB) are clearer, and have the Stickerbacks as an insert set. The 1988 set should be changed to follow suit.
The OPC sticker checklists for these three years are identical, and the 1988 OPC Sticker checklist here on TCDB is fine. Copy/Paste it, lol.
Whoever uploaded the checklist for the 1988 stickers probably lifted it out of Standard, where they did it that way for the first two years. They wised up by 1990, and listed the stickers in order, with a number in parenthesis behind the name if that sticker was paired with another. That way you could tell if it was a double, and which number it was paired with. I think that's a good idea, and I wouldn't mind seeing it used here for all the sets that have paired stickers (or tripled or quadrupled).
If you have two stickers on one card then you have three items: two stickers and a card. They can all be separated. If you're worried about your card count, just don't count one of them. It's the same for all the topps stickers from 1981 on up.
When you take the stickers off their stickercard backing, both the stickers and the stickercard have a blank back. We should leave the backs blank. Otherwise, Varoomed is right: we'd end up with a bazillion variations.
The OPC stickers themselves are EXACTLY the same. Only the Stickercard backing is different. (As well as the combinations in which they are found, but that's a whole 'nuther can 'o worms).
I collect Bert Blyleven and people are finding different backs to his stickers all the time, so I know a little bit about these sticker things. :)
"The world is made for people who aren't cursed with self-awareness".