When Dick is drunk and Jim hits him, you can hear the sound before you see the punch.
During the surgery after the train accident, no one in the operating room were wearing their face masks properly. The masks were not covering their noses, which were fully exposed, but only mouths were covered.
After Jones renews his pilot's license in his real name (Stanton), the airline should have become aware of his true identity since he'd have had to present his renewed license, identifying him as Stanton, to work as a pilot.