When imitating Alexander Haig doing late night commercials, Robin sang, "If you want a better deal, go see Al." This was a parody of commercials in Southern California at the time for Cal Worthington Ford in Long Beach. (The "go see Cal" part was often also mistaken as "pussy cow" due to how the singer said it.)
"Ninny-ninny" is Robin's derogative referral to his "nanu nanu" from "Mork and Mindy".