Jimmy Stewart's granddaughter

Jimmy Stewart's granddaughter is the granddaughter of Jimmy Stewart.

History
After the premiere of Mr. Smith Goes to Washington, Jimmy Stewart's granddaughter slapped Homer and because she thought the movie was so bad. She also said they'd hear from her attorney.

Behind the Laughter
The version of Mr. Smith Goes to Washington in the episode was a remake of , which Jimmy Stewart starred in, hence his granddaughter being so angry about it.

In real life, Jimmy Stewart doesn't have a granddaughter.