Audio problem: When Judy asks "But Grandpa, why didn't you tell us what was going on?" towards the end of the episode, she is speaking with Jane's voice.
The Jetsons (1962)
1 mistake in A Visit from Grandpa
Starring: Mel Blanc, Daws Butler, Janet Waldo, George O'Hanlon, Penny Singleton
Cogswell: There's only one thing worse than war and that is business, and Spacely has declared business on us.