Ralph Wiggum was named after Ralph Kramden on "The Honeymooners" because the character was intended to be a loudmouthed smaller version of Homer. He wasn't established as Chief Wiggum's son until "I Love Lisa." See more...
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The Simpsons (1989) - 12 mistakes in "Marge Gets a Job"
Audio problem: Ms. Krabappel is telling Bart about the laundry list of sicknesses he had to get out of the test. You can see her mouth doesn't match up when she mentions "...and that unfortunate case of rabies." The studio actually changed what Ms. Krabappel originally said which was "and that unfortunate case of "Tourette's Syndrome." [Some reports say that the original line of Tourette's Syndrome was left in syndications in certain areas. On the DVD version the rabies line has been used].