- Sequel Gap: The final book, Janie Face to Face, was published in 2013, thirteen years after the previous installment, What Janie Found.
- Technology Marches On: The titular Face on a Milk Carton would be superceded by the AMBER Alert system only a few years after the book's publication. Much of the first book would also have been resolved instantly if Janie could have just Googled herself.
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