Old Shame: Nintendo prefers not to bring up this debacle of a game nowadays.
Averted with Marc Graue (who provided the voice of nearly everyone in the game). In an interview, he said he had lots of fun doing the voices and he's happy that they're being used in YouTube Poop despite being more than a decade old.
What Could Have Been: This wasn't the only Mario game planned for the CD-i. Two more, titled Super Mario's Wacky Worlds and Mario Takes America, were planned, but were cancelled due to a variety of issues.