This mistake is very
common when listening to vinyls. The error can provide a great deal of
embarrassment depending on the time it takes you to notice it, and the amount of people present.
There are also lots of
12"s with different RPM on each side. With those, the screw-up is very easy to make.
But at least in
minimal or
experimental electronic music, a record can in some cases work just as well or even
better at the wrong speed. Especially the works of
Wolfgang Voigt can provide surprising results this way.
In some instances, the wrong RPM is
deliberately printed on the label for this reason. (I recall this being done by Voigt on
Profan.)