Deliberate mistake: When Luther is disarming the bomb, Nathan asks how much time is left. The timer is shown with 2m 29s and counting. Following a lot of talking, Luther eventually cuts the wire, triggering the explosion. In real time, 2m 51s passes from when the timer was shown to when the explosion happens.
Deliberate mistake: The Boeing Stearman biplane isn't built with a bar between the wheels. The bar on the aircraft in the film is purely for the stunts and actually compromises the aircraft's suspension.
