In the opening credits, the cash register shows $847.63 when Maggie is "scanned" (figure was taken from a survey (found by Matt Groening) done at the time that said that this was the average monthly cost of caring for a newborn baby - food, clothes, health, etc.). But during "The Simpsons" (1989) anniversary show (hosted by Troy McClure) the credit sequence is paused and the machine is shown to read "NRA 4EVER"