Factual error: Just before Edward Bloom parachutes on his secret mission during the Korean War (1950-1953), he looks at his wristwatch. The camera shot of his wristwatch shows the second hand advancing one entire second at a time, indicative of a quartz watch. The quartz watch would not be invented until 1960 by Bulova. Prior to that watches used an escapement movement in which the second hand "tics" at a finer and smoother rate.
Suggested correction: Remember that what we are seeing is William's mental picture of the stories his father told him. He never lived in a time without watch movement like that and therefore would think it moved like that.