When King Koopa evolves Spike into being smarter, Spike asks Iggy, "Iggy, do you know what the square root of 26,481 is?" Iggy doesn't know, so Spike answers, "191." If math is one of your strongest suits, you'd know that 191 is the square root of 36,481, not 26,481. The filmmakers were off by 10,000. They probably didn't expect to get it right, but it happened. If Spike is supposed to be smarter after Koopa evolves him, he shouldn't get it wrong, after all, he's smarter after the evolution.