I generally don't collect things like these, but recently came across a group of a dozen 1952 Bowmans with the backs printed upside down and wrong player.
Several HOFers are involved. I've included a shot of one of them. It has Hank Bauer on the front, but on the back, printed upside down, is Roy Campanella.
Other stars include Robin Roberts (Gil McDougal back) Sal Maglie (Bob Feller back)
I'm curious as the whether there is any value in these? Does anyone out there collect these (fairly) recent oddities?