Factual error: Louis Simo gives his son an Etch-A-Sketch while taking him to school, and later when Louis stops by to see his son at his ex-wife's house, his son is playing with the Etch-A-Sketch in his bedroom. Both incidents take place in the summer of 1959. George Reeves died June 16, 1959, hence the investigation. The first Etch-A-Sketch toys were produced on July 12, 1960 and Ohio Art launched the toy in the United States in time for the 1960 holiday season.
Factual error: As the two fast boats start heading up river towards the finale shootout, one boat has its navigation lights reversed. It has a red light on the starboard/right side, and a green light on the port/left side. It should be the other way around. (The lights on the other boat are correct.)
Factual error: Several characters can be seen playing an Xbox game console, which was not released until 2001, although this movie is set in 1999.
Factual error: When the crowd is gathered outside of the Armstrong homes, there is an extra wearing a "G-Unit" shirt. The movie was set in 1999, but G-Unit didn't launch their clothing line until 2003.
Factual error: Troy has several chains attached to his body, of which two are attached to his Achilles tendons. This is the structure of the leg that allows you to stand and move, so as soon as he ripped them out, he would have fallen over and been unable to walk.
Factual error: The hanging is shown using the "standard drop", with a trapdoor, breaking the neck. This was not introduced until the 19th century (after France had abandoned the gallows for the guillotine), whereas the film is set in the 18th century. In those days the victim was just strung up on the gallows and left to strangulate (the "short drop").
Factual error: In the parking lot of the race track, as the camera zooms out you can see a new Ford Thunderbird. This is impossible, as the scene takes place in 1979.
Factual error: While the film is supposedly set in the late 19th Century, the locomotive is oil-fired. The tender carries neither wood nor coal. There is no way the Mexican National Railroad would possess oil-burning locomotives in this time period.
Factual error: The President goes to the G8 summit in Toronto at the end. The G8 is comprised of Canada, United States, Britain, France, Italy, Japan, Germany and Russia. In the room there are a number of non-G8 countries represented.
Factual error: At the end when Ryan Reynolds unplugs Israel and Sparazza, both Israel and Sparazza die. Only Sparazza is on a ventilator. Israel is on a regular oxygen mask, which requires the patient to be breathing without assistance, such as a breathing machine. The type of mask Israel was on is not a life support mechanism that would be affected by being unplugged, as it either runs from O2 from a wall insert or directly from an O2 tank, both of which run without electricity. I work in an ER so I know how O2 systems work.