It's really an amazing story, Elser planted a bomb where Hitler was to speak, perhaps the Beerhall where the putsch began, see article. The article says Hitler cut his speech short missing the bomb by
13 minutes but 7 Nazi officers and a waitress were killed.
The title of the film, 13 minutes.
http://www.youtube.com/watch?v=X5-NdI9Lr3oIt would not surprise me if there were a number of attempts on the Fuhrer's life.