John Ritter’s Child
In the opening of the show, when the Three’s Company theme song is playing, we see a little kid walk up to Joyce DeWitt while she’s feeding a goat. That child is actually John Ritter’s kid, Jason.
Billy Crystal Auditions
We can’t imagine anyone as Jack other than John Ritter but that doesn’t mean that the casting directors agree. Apparently there were a few quality talents that dropped in to audition for the role: Billy Crystal, Barry Van Dyke, and Michael Lembeck all took a swing at the gig.