David and Ricky used no doubles at any time. All their stunts were actually performed by David and Ricky themselves.
According to David Nelson's DVD commentary, this was the most expensive show to produce in the 14-year history of the series.
In the commercial for Kodak, it shows scenes supposedly shot during the Nelsons' holiday in Hawaii in 1959.
In this program, whenever Dave and Rick have a dialogue scene,no matter what the content, the laugh track stops, as if they were suddenly in a serious drama. Very strange. Don't know why this was done, it's certainly not for any comic effect.