Factual error: The movie is set in 1979-1980. You can see vehicles all throughout the movie that were manufactured after 1980.
Other mistake: Given that Cassandra's parents are so incredibly rich, spoil her rotten, buy her anything, and have even got her a luxury apartment, why on earth is she flying to the USA in economy class?
Continuity mistake: When the two young lads jump off the bridge to escape in handcuffs, as they fall together the handcuffs disappear. (01:12:00 - 01:13:00)
Deliberate mistake: The (fake) confession letter was postmarked from Ohio and sent to Allison Connor, 331 Henry Lane in Hilliard, MB 21243. No U.S. state has a postal abbreviation of "MB." The way the "B" was written in thick bold letters made it resemble a "D" - "MD" represents Maryland (where the film apparently takes place). Also, there is no current 21243 zip code in the U.S. There is a 21241 for Baltimore City and the next consecutive zip code is 21244 in Baltimore County. The created address LOOKS real. (00:50:44)
Continuity mistake: Jason spits blood onto Joker's chin which changes spot wise and shape wise by the next shot.
Factual error: Golf carts (or buggies, as they are known in the UK), are not permitted at St. Andrews without a medical reason. The characters to not appear to suffer from any apparent disabilities. (00:11:30)
Other mistake: When the three main characters see the composite sketches of themselves on the news, Chris Hemsworth says "Oh shit" in his natural Australian accent.