Including the Thomas No Name printing defect would open it up to a ton of unrecognized obscurities, but here are some more non-defects that are much rarer compared to the other cards in their set. Since R72 is included, I am not restricting to baseball. Since some of the cards on the OP are not SP'd for some sort of prize, not all of these were SP'd for that reason (for many, while people will claim to know the reason, there is no evidence proving a particular theory for why they were SP'd). Off the top of the head:
A number of E90 American Caramels, with debate on which are the most rare.
T70 - Declaration of Independence Triple Folder.
T220 Silver - Jas. J. Corbett and Mike Donovan.
T226 - Gans, Jeannete, Johnson, Langford.
T227 - C.P. Rodgers and Bruce Brown.
US Caramel William McKinley.
1948/49 Leaf Boxing - Rocky Marciano.
1951 Topps ML All Stars - Konstanty, Roberts, Stanky.
1953 Glendale Meats Art Houtteman
1954 Bowman Ted Williams (rarity oft overstated, but much tougher than the other cards).
1959 Fleer Ted Signs for 59 (rarity greatly overstated, but much tougher than the other cards).
1960 Fleer Pepper Martin.
1964 Auravision Willie Mays.
Numerous cards in the 60's Post series.
1968 Atlantic Oil winner cards, especially Freehan and Agee
1976 Topps US Presidents Gerald Ford.
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