Character mistake: All the characters wearing gas masks are wearing them with the straps over the hoods. I was army trained, and you always wear the mask next to the skin for best seal, with the hood over the top.
Character mistake: When Steve is at the Smithsonian, he reads the biography of his friend Bucky. At the start of the description, the bio reads "Born in 1916...", but at the bottom of the description, it reads "Bucky Barnes: 1917 - 1944." (00:18:35)
Character mistake: Shortly before the drone chase scene Cooper tells Murph to put the truck in second gear. She pushes the gear lever forward, however on the 6-speed manual in the Ram 3500 second gear is in the back row.
Character mistake: When giving Eggsy a tour, Galahad tells him that Oxfords are any formal shoe with open lacing. This is incorrect as Oxfords have closed lacing.
Character mistake: Olson discovers a "microchip blocking the self-assessment program" and says, "it's a worm"! It is not. "Computer worm" is a type of malware that propagates over a computer network. What Olson discovers is an act of sabotage of malicious nature, but definitely not a worm. (00:25:39)
Character mistake: Nikki lost her insulin kit and needs insulin. Her mother suggests getting her a fruit juice, something sweet. Fruit juice contains a large amount of sugar which raises blood sugar levels very quickly. Therefore, people with diabetes are usually best to avoid drinking fruit juice. Her suggestion is absurd.
Character mistake: During the scene at the office of the University of Oxford, the Union Jack is hanged the opposite way from the proper position. (01:23:10)