Deliberate mistake: John is shown repeatedly studying Lucinda's numbers and even copies them to a whiteboard, and yet when Diana notices the backwards EE at the end, he's surprised and obviously acts as though he hadn't noticed them before, straining credulity, since he had just as obviously obsessed over the numbers and couldn't have missed the letters beforehand. (01:08:40)
Knowing (2009)
1 deliberate mistake - chronological order
Directed by: Alex Proyas
Starring: Nicolas Cage, Rose Byrne, Chandler Canterbury, Lara Robinson
Continuity mistake: When John is driving to the gas station, the back door of his car is missing, although it was there when he was driving from his house.
Diana Whelan: What happens when the numbers run out?
Question: The whisper people bring the selected boy and girl to safety before the final day of earth. Why do they plant a message to be found and decoded just before the final day? I do not think the whisper people need any help from any humans to save humanity (and organize a whisperers' version of Noah's Ark).
Answer: There is no intention on the part of the whisper people to warn humanity as a whole, merely a select group of children who appear, due to their telepathic powers, to be the next stage in human evolution, and their respective guardians.