Multiple times throughout the series Tony Jr. exclaims "He's the guy" which was a catchphrase of Adrian Monk on Monk also created by Andy Breckman.
Tony Danza had his first child, a son, at 19. Danza said that being a young dad helped him to relate to his son as a friend. It was this relationship that he used for inspiration between Big Tony and Tony Jr. (Josh Groban)
This series is the sixth time that Tony Danza's character is named Tony.
Josh Groban's character's last name is Caruso. He also sang a cover of the famous italian song "Caruso" in 2003.
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