George O'Hanlon had suffered a stroke, so when he made late The Jetsons (1962) series and the movie, he was practically blind and had very little short term memory. He had to have each line spoken to him so he could repeat it back.
A few moments before his death, George O'Hanlon had recorded all of his dialogue for George Jetson. According to voice director Andrea Romano, O'Hanlon had suffered a second stroke and found it difficult to read and hear and in the end he died in the recording studio doing what he loved.
Jeff Bergman was used in some scenes, because George O'Hanlon and Mel Blanc died during production. The film is dedicated to the memory of both men.
The last film project of George O'Hanlon, Penny Singleton and Mel Blanc. Penny retired after this work.
Janet Waldo, voice artist and the original voice of Judy Jetson, recorded the part for this film but was later replaced by then-pop starlet Tiffany. Studio executives hoped that Tiffany would attract a younger audience. Waldo continued to voice the part in subsequent 'Jetsons' productions.
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