Jay Easton previously appeared as Richard Keller the premed student in an earlier installment called "Rosie the Actress" when he meets Rosie in the library. He was not listed on the DVD's credits, but it was the same actor playing the role.
Carleton Carpenter, who played Michael Robinson, was most famous for singing the song "Abba Dabba Honeymoon" with Debbie Reynolds in the musical "Two Weeks with Love" (1948). He also worked with Debbie Reynolds in the musical "Three Little Words" (1950). Many fans also recognize him for his work in Judy Garland's last MGM film Summer Stock (1950).
Warren Berlinger who played Howard Kane played Stockard Channing's one time boyfriend Herman Anderson (the plumber) in the black comedy "The Girl Most Likely to..." (1973).
The first young man Rosie is seen dating is named "Stanley Hess" (played by Warren Berlinger). However, in the end credits, his character name is listed as "Howard Kane."