Factual error: The poster of solar system photo mosaic shown on wall of Sam's bedroom was not made until the early 1980's.
Plot hole: When the girls are looking through the old newspapers in the library, Roberta stumbles upon the newspaper's story of her mother's death. But this takes place in 1970; Roberta's mother died when she was four, meaning her death occured in 1962. Yet they were looking for Dear Johnny's death, which happened in 1945. Why would she be looking at 1962 papers? (00:39:15)Hamster