People understandably expect to be presented with facts when they watch a documentary. There are, however, some notable or high-profile things that documentaries got wrong. Although truth and authenticity are elements every nonfiction film should strive for, movies are made by people, and sometimes people make mistakes, or have a bias or agenda related to a controversial subject that leads to inaccuracies, omissions, or misleading conclusions. Historical documentaries are particularly susceptible to these flaws.