I feel that even though the movie wasn't merchandised well, it seems like the Wendy's kids meal promotion was advertised more than the actual movie was (well, that's advertisement money Columbia/Henson didn't have to spend, basically free publicity while also getting paid for the license).
I often wonder why all of the Wendy's Kids Meal items were so different from each other. There's a minature Electric Mayhem Bus (which is cool, I know many fans were wanting one at the time), a Kermit keychain, a Gonzo space vehicle, an activity book, and a microphone. So two pieces of character merchandise, two toy cars, an accessory, and a activity book. Why not just make it all character toys? Perhaps all plush keychains like the Kermit. They could make made keychains of Gonzo, Rizzo, Miss Piggy, and Pepe (or Fozzie or Animal). Why include an activity book as an option alongside toys? Did Wendy's normally have kids meal promotions where every item was significantly different (I honestly can't remember)?