The Young Sheldon finale features a cameo from Jim Parsons as Sheldon from the future, and he accidentally exposes Mary's behavior while looking back at his childhood. Despite long outgrowing its original premise as the boy genius' origins story, Young Sheldon still wraps up once his time in Texas ends. Aside from dealing with the aftermath of George's unexpected death, the special capper also features the first and only appearance of Parsons, who reprises adult Sheldon writing his memoir.
This effectively explains why he has been narrating certain experiences living in Medford.

Parsons' Young Sheldon finale cameo is a great way to wrap up Sheldon's 17-year arc on TV. It brings the character full circle, as he contemplates the impact of his family in his eventual life. The cameo also effectively resolves the plot inconsistencies created by his more critical stories about George in The Big Bang Theory, as he remembers his dad more fondly.
While his relationship with his father is used as a parallel to his dynamic with his own son, Parsons' adult Sheldon also briefly talks about his mother.
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