Arthur mentions that he was 44 years old when Carrie was born. In real life, Leah Remini was born exactly one week after Jerry Stiller's 43rd birthday.
Before Arthur tells Doug the story of how Carrie was conceived, he mentions how him and his wife, Sophia, lived in Greenwich Village at the time. The actress playing Sophia in the flashback sequence, Nadia Dajani, grew up in Greenwich Village.