Most of the movie is based on true events, but they got the age and birth order of Tannie wrong. She is suposed to be Tom's older sister, like much older sister. :) But, we enjoy this small mistake in the movie.
If you have TCM it on this Thursday, December 23rd, 2010 at 2:00 PM.
"Lux Radio Theater" broadcast a 60 minute radio adaptation of the movie on December 23, 1940 with Mickey Rooney and Virginia Weidler reprising their film roles. You can listen here (Right click link to download mp3).