During the scene where Elyse is is playing her guitar she has a capo on her guitar then the capo is off. (This was used in a promo for Family Ties for Nick @ Nite.)
Bud: Haven't seen you folks in a while.
Steven: Well, I've been doing a lot of the plumbing repairs myself lately.
Bud: Great! Maybe I'll get that new van I've been looking for!
Steven: (practicing his script for the television pledge drive) "Hi, I'm Steven Keaton, manager of WKS. I know when you met the other people who work here, you also met their families. But my children don't care enough about their father to be here."
Steven: Too rough? Okay, I've got an alternative. "Hi, I'm Steven Keaton, manager of WKS. You've already met my wife, Elyse. I guess you can tell we have no children."
Elyse: (discovering that Steven suddenly has to leave) But he was going to lend me moral support!
Alex: We'll give you that, Mom!
Mallory: Yeah, we'll cheer you on.
Jennifer: We'll clap really loud, no matter how bad you sing.
Elise sings "Believe Me If All Those Endearing Young Charms". This song is the same gag used on Warner Brothers cartoons to trigger an explosion on a piano/xylophone, where the patsy gets exploded. It can be found on these cartoons; "Ballot Box Bunny" (Bugs Bunny/Yosemite Sam) 1951, "Show Biz Bugs" (Bugs Bunny/Daffy Duck) 1958 & "Rushin Roulette" (Road Runner/Wile E. Coyote) 1965.