YMMV / Frequency

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• Breakaway Pop Hit: "When You Come Back To Me Again", by Garth Brooks.
• Complete Monster: Jack Shepard is a cop who moonlights as the Nightingale Killer, a Serial Killer who targets nurses, strangling them to death and stealing their jewelry. By 1969, he had already murdered three women this way, and when John Sullivan, a cop in 1999, prevents his father Frank from dying in 1969 ^note  using a ham radio that can communicate with the past, he also inadvertently causes his mother, a nurse, to save Jack Shepard's life, allowing his murder spree to continue. By 1999 in the new timeline, Jack had murdered 7 more women, including John's mother, who had saved his life, and Jack's own loving mother. Frank and John attempt to stop the murders in the past, but Jack catches on, beating up Frank and stealing his driver's license to place on his latest victim and frame Frank for the murders. Near the end of the film, he attacks both John and Frank "simultaneously" in 1969 and 1999, and after handcuffing Frank, attempts to rape his wife. When Frank frees himself and aims a shotgun at Jack, he takes a young John hostage, threatening to snap the kid's neck.
• Retroactive Recognition: Michael Cera appears as Gordo's son.
• They Wasted a Perfectly Good Character: The rookie firefighter whom Frank saves in the opening scene feels like he could be a good ally but has no real role in the subsequent events of the film.
• Unintentional Period Piece
  • The premise for the film includes John using a ham radio to talk to Frank thirty years in the past; for that timeline to make sense the film obviously takes place earlier than 2010, since ham radios weren't really a fad by the 80s and onwards.
  • One of John's friends bemoans that he had the chance to get into Yahoo! on the ground floor and didn't take it, so John is sure to tell him as a kid to remember "Yahoo". A Brick Joke at the end of the film implies he's now extremely wealthy. The choice to use Yahoo for this plot point plants the film as firmly in the last 90s-early 2000s, when Yahoo was still huge.

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