I have not read the books. I loved the movies. This seems like nit picking. The Trilogy will stand as one of the all-time great movie series, along with “Star Wars,” “Rocky,” “Dirty Harry,” and perhaps the James Bond series.
Here’s an interesting take on a subject... you might enjoy..
Time travellers: please don’t kill Hitler
http://www.theguardian.com/science/brain-flapping/2014/feb/21/time-travellers-kill-adolf-hitler