Catch A Falling Star - May 21, 1979 - S2-E10
Character mistake: In the preview for this episode, Charlie has trouble getting his countdown straight. He shouts that Sam is on in 50 seconds, then 47, then 48. In the episode itself, the mistake is corrected with a rather obvious overdub, changing the final number to 43. (00:02:05)
Character mistake: After Pronto warns Mario of the path being a trap, Mario says that he earned an A plus for unclogging drains in the Brooklyn Plumbers Academy. However, in "Plummers Academy", he actually flunked out of the academy along with Luigi. (00:09:29)