- California Doubling: Set in Dublin, but was shot in a studio in Scotland.
- Cast Incest: O'Carroll's wife Jennifer plays Mrs Brown's daughter. Also, his daughter plays one of his daughters-in-law and his real-life daughter-in-law plays another; his sister plays Agnes' best friend and his son plays a friend of her son's.
- The Danza: Rory's first actor was also named Rory. This is no longer true now Rory has been recast.
- The Other Darrin:
- Maria's mother Hilary was recast between Series 1 and the first Christmas special.
- As of the 2017 Christmas Special, Rory is now played by a new actor. This is explained in show that he underwent plastic surgery.
- What Could Have Been: There was plans for a spinoff based around the salon where Rory and Dino work
- Written by Cast Member: Brendan O'Carroll
Trivia / Mrs. Brown's Boys