Continuity mistake: During Yakko's song, an eraser keeps appearing and disappearing from the chalk tray beneath the Multiplication problem.
Continuity mistake: When Yakko is multiplying 47 by 83, he walks away from the chalkboard and continues to sing. But one shot before he finishes solving the problem, the answer appears on the board.
Answer: According to the Animaniacs Wikia: "Baloney is one of the few people capable of truly terrifying Yakko, Wakko and Dot, largely due to being impervious to their violently physical brand of humour and his inability to understand how much they despise him."
lionhead