edk...I can verify the following as having them in my collection:
1981 Donruss Checklist 1-120 with card #51 Donohue spelled correctly "O" not A
1990 Donruss 665b DK back but numbered 659
1990 donruss 659b 5000K back but numbered 665
As for the following:
1981 Fleer #24b "KEN" on front "Kevin" on back - Bobscards I believe has talked about this one in the past and having it in his collection. I'd love to find one, but haven't been lucky enough yet. Pretty sure it exists, but can't say with 1005 certainty.
1982 Topps #346a I am 99.995% certain this card does not actually exist.
1983 Donruss #88c "BRYN" spelled correctly on front and back - I haven't started looking for most of the Donruss variations yet, so I can't say if it exists or not
1990 Donruss 700a no #716 with #715 being the last card in left column, BC's right column - I haven't started looking for it yet, so I can't say if it exists or not.
Hope that helps.
Greg
Always looking for baseball variation/error cards and anything Garrett Whitley or Ian Anderson