Factual error: Milo says Audrey is a "teenager". Which she is, but this is 1914! People didn't use that word back then. He probably should have said "adolescent" or something.
Factual error: Near the end of the film, during the big shootout scene, there are 2 girls vs. Will Farrell. If you play the movie in slow-motion, you can see that the guns the girls are shooting continue to shoot fire out of the barrel several times, even though the slide is locked back. When a handgun's slide locks back, the magazine is empty. How could they still be shooting when there are clearly no bullets left?
Factual error: The main character, a petite flight attendant, cocks the charging handle on a Mini-Uzi. The weapon had previously fired rounds so her action would eject a live round or in the event of a smokestack jam - a spent shell. Neither happened.
Factual error: The shot of the plane in the Melbourne airport before it took off, and the one in Los Angeles after it lands are of the same place.
Factual error: When the protagonists arrive to Patmos, latitude and longitude are switched the other way around at 26°489 and 37°411. Moreover, that's not Patmos, but Anydro Patmou, an uninhabited islet unlike what is shown here.