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* BreakawayPopHit: "[[https://www.youtube.com/watch?v=oK9cN80K4yk When You Come Back To Me Again]]", by Music/GarthBrooks.
* CompleteMonster: [[BigBad Jack Shepard]] is a cop who [[KillerCop moonlights]] as the Nightingale Killer, a SerialKiller 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[[/note]], 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, [[UngratefulBastard 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 [[FrameUp 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 [[WouldHurtAChild takes a young John hostage]], threatening to [[NeckSnap snap the kid's neck]].
* RetroactiveRecognition: Creator/MichaelCera appears as Gordo's son.
* TheyWastedAPerfectlyGoodCharacter: 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.
* UnintentionalPeriodPiece
** 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 Platform/{{Yahoo}} on the ground floor and didn't take it, so John is sure to tell him as a kid to remember "Yahoo". A BrickJoke 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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