In the opening credits, the three girls are shown running down a hill that has several flowers growing on it. In reality, the flowers were fakes, and Melissa Sue Anderson (Mary) tripped over one of the fakes during one take and gave herself whiplash. See more...
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Continuity: At the end, when Lars Hanson hears the church bell ringing, he gets up from his bed and goes to look out the window. When he first gets up, his hair is completely tousled - definite "bed head." The shot changes to show him leaning out the window, and his hair is neatly combed. When the shot returns to the inside of the room, his hair is once again rumpled and untidy.