When Chip (Stanley Livingston) is looking for a number in the phone book, when he locates the incorrect number, you can hear someone in the laugh track say "Uh oh." That was Lucille Ball's mother Dede, who attended live tapings of I Love Lucy. During one taping, she blurted out "Uh oh" and the recording was preserved. My Three Sons was produced by Desilu, and the laugh track - along with Dede's "uh oh" - was used in many of their various television series for years.