The dance announcer hosting the dance contest is Rance Howard Ron Howard's (Richie Cunningham) father in real life
When Marion says "I need some advice," her voice changes and her words do not match her mouth. The line was changed and dubbed.
Early in the episode, Howard speaks the line "That's that, and that'll be that, and that's the end of that". Tom Bosley, who plays Howard, spoke this very same line in the 1965 Broadway play "Catch Me If You Can". It is likely that he added the line himself when taping.
Although it had already been established that Howard Cunningham was a cook in the army, when his wife and daughter aren't able to cook for him, he acts as if he will starve if he doesn't order dinner from Arnold's.