Continuity mistake: In the airplane, the window shade in the seat next to the main character repeatedly opens and closes between shots.
Continuity mistake: After the old folks turn into kids, Harry, the boy with the glasses, is seen climbing up the side of the house, yet in the next shot, he is running through the bushes toward the camera.
Answer: Due to production logistics, movies are rarely filmed in a linear timeline. Storyboards visually map out the entire plot to provide the director continuity while filming different scenes, in various order, and often simultaneously with second-unit directors. As to the movie, Morrow's segment was originally supposed to end with the Vietnam scene. After Morrow rescued the two children, thus redeeming his character, he was to be returned to his own timeline. However, after the fatal accident and with the filming incomplete, the scenes were reordered so that the segment now ended with Morrow being sent to a Nazi concentration camp.
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