Alan tells the director and playwright that Rob is Vito Schneider, the tailor. Schneider is the German word for tailor.
According to Carl Reiner, Rob's job of ghost writing in secret for Harper Worthington Yates on behalf of Alan Brady, was based on writer Garry Marshall's experiences writing undercover for comedian Joey Bishop on Broadway.
The line about a famous play-doctor named Dave Murrows makes reference to the real-life Abe Burrows.
Alan's exclamation to Rob, "You're a person!", is a translation of the Yiddish, "You're a mensch!", a very high compliment.