Other mistake: While Rick plays guitar and sings at a dance, the drummer behind him appears to be playing but never touches the drums or the cymbal with his drumsticks.
Other mistake: Five young boys in Ozzie's backyard are pretending to shoot each other with toy guns. Ozzie pretends he's been shot and falls to the ground. When he sits up, the boys compliment him on the way he "died great." Ozzie then tells them about his great-grandfather, a gunfighter known as Six-Gun Nelson. Following a fantasy sequence with Ozzie portraying Six-Gun Nelson, Ozzie is now magically wearing a gun belt with two holsters and two guns.
David and the Stewardess - S6-E15
Other mistake: Rick is playing an acoustic guitar in his bedroom, but the sound we hear is that of an electric guitar.
Other mistake: Ozzie says the fiscal year of the Men's Club runs from September 15th to September 15th. A fiscal year beginning September 15th would run through September 14th.