Love Is a Many-Splendored ThingGoofs
When Mark is at war writing and a butterfly lands on his typewriter, the close-up of the page clearly shows he was writing to inform her that her "twenty-third letter has arrived". In a scene not long after, the letter has reached her and as she reads, his voice-over differs, saying her "eighth and ninth letters have arrived". A line about his bottom hurting from bouncing around in jeeps matches both letters.
During the scene with Mark and Suyin in the airplane: after they land and the announcement says they can remove their seat belts, both actors do as they are supposed to and release their belts. Then Mark stands up but you can clearly see through the aircraft window that the scenery still shows them in a taxi movement.