Very popular series of mistakes made on radio and TV. The earliest is Harry Von Zell introducing President Herbert Hoover as “Hoobert Heever” in 1931. Some of the bloopers were recreations since they happened live and Schaefer didn’t have a recording. That was the case with Von Zell. It really happened at a birthday presentation and Hoover wasn’t there.
A recreation about an incident on a children’s program caused a lot of controversy. It may never have happened.
There were at least five volumes released and several compilations. There are enough real bloopers to make it fun.