The G moneybag on the cover of Fortune Street reminds me of the ones from Shake It:
Not sure if this truly qualifies, it could very well be related to Dragon Quest instead for all I know, but it's at the very least a similarity.
Well half and a half, they said that Charles Martinet isn't the first voice of Wario, which is true.
But this version of curious facts is more reliable:
According to this, Wario was planned to make a second appearence in a New Super Mario game.
An actual feature was dropped, enjoy your decorative reward!
Wario in Mario Kart Arcade GP DX has a boxing glove contraption, very similar to the one he has as Genius Wario in Master Of Disguise, as his special item:
Did we ever mention Mario's Super Picross?
Cause I'm sure this background looks familiar:
It's all Wario's powerups from the first game!
http://www.spriters-resource.com/snes/marionosuperpicross/sheet/60526/