Frequency

Factual error: A ham radio requires the person to hold down the button while talking. Numerous times in the movie they are talking without pushing the button.

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Suggested correction: This is actually subtly addressed in the film. The magic which allows the radio to work across time also allows the two men to speak without pressing the button. There is a moment where Frank wonders what is going on with the radio and presses the button a few times to talk but then notices that he doesn't have to press the button to be heard.

BaconIsMyBFF

If that was true, then it wouldn't make sense for them to continue to show Frank and John hitting the squawk bar throughout the film.

Bishop73

That is a separate issue. The mistake entry states that you need to hold the button to talk on a ham radio, which is true, but the magic ham radio in the film doesn't require it. If the actors continue to occasionally press the button that could be considered a character mistake but it could also simply be a force of habit by the characters.

BaconIsMyBFF

Factual error: When Shep and his partner are looking for Frank on the docks in 1969, the camera pans to the left and we see a flash of the (completed) World Trade Center buildings just before the cameraman catches his error. In 1969 construction had only just begun on the towers.

Factual error: The radio used in the film is a Heathkit SB-301 receiver only, and is, in reality, incapable of transmitting.

Factual error: In the year 1969 Dennis Quaid reaches into a pile of Albums (vinyl) to play the "King". One of the albums in that pile is "Elvis In Concert" which was not released until 1977. (00:07:40)

Factual error: When the first change in the past takes place, the victims go from three to ten. One of the victims is John's mother. He would never be allowed to be part of an investigation with his mother as a victim.

Factual error: When Shep and his partner are looking for Frank on the docks in 1969, the camera pans to the left and we see a flash of the (completed) World Trade Center buildings just before the cameraman catches his error. In 1969 construction had only just begun on the towers.

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John Sullivan: I may not know who he is, but I know where he's gonna be and how he's gonna get there.

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Question: What did John mean when he told Jack at the bar that Jack's mother was the nightingale and it would have led to Jack? Did Jack kill his own mother? Also why did Jack Shepard, a supposed serial killer, stop killing?

Answer: Florence Nightingale is considered the founder of modern nursing and nurses are often called "nightingales." It has nothing to do with Jack's mother telling on him or "singing like a bird." Whether or not Jack killed his mother is left ambiguous, but it does seem like that's what they are suggesting. In the film we are told Mary Finelli was his first victim. However, they seem to imply that Jack's mother's killing was not associated with the "Nightingale Murders." Had the police connected her murder to the "Nightingale Murders", it night had led them to Jack. So Jack changed his M.O. after killing his mom, which I take as targeting younger nurses. In the film, Jack's dad tells John that Jack got caught up in the Knapp Commission, which was an investigation into police corruption. Jack went to prison, which is why he stopped killing. In the film, it's suggested that perhaps the killer (before they knew it was Jack) was taken off the streets (i.e. sent to prison for a crime not related to the killings) and smartened up once he got out of prison. There's no suggestion that age or lack of testosterone is what stopped Jack from killing after getting out of prison. Of course, it's also possible he did kill again, but due to the gap in killings, those murders aren't related to the "Nightingale Murders." But all that is speculation since they don't really reveal any of that information and it's not central to the plot.

Bishop73

Answer: I can answer part of your question. Most serial killers are under the age of 50. Testosterone levels drop after that age, and it is thought that this may reduce a psychopath's urge to kill. The nightingale reference may be the same as the slang term, "to sing like a bird," which means someone gives up information easily. Jack's mother may have provided info about her son, either knowingly or unknowingly.

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