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Adaptation Induced Plot Hole / Percy Jackson and the Olympians

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    The Lightning Thief 
  • The Lotus Casino is a holdover from the book that throws a wrench into the film's sequence of events. In the book, Percy was questing to recover Zeus's master bolt from the Underworld in order to return it before the summer solstice deadline, which is why the group's five-day stay in the casino was significant for wasting so much precious time. In the film's version of the story, the motivation is changed to rescuing Percy's mother from the Underworld; the missing bolt and the deadline aren't pertinent to the quest at all up until the end, meaning the casino setback should no longer be that significant. And yet the three heroes still act like it is, saying that they must hurry on to the Underworld despite being given no reason to think that Zeus's bolt is even there, to say nothing of the fact that they weren't looking for it.
  • Rather than just having Percy come across the guy from the 70s on his own like in the book, in the film, Poseidon has to warn him telepathically about being trapped inside the casino before he thinks to investigate anything. But he still only does this after Percy has been inside the casino for five days, raising the question of why he waited so long when time was of such a crucial essence.
  • Persephone is shown to be in the Underworld at the time the heroes visit there, which is on the eve of the summer solstice when she should be in the world above, like she was in the book. Even stranger is that she acknowledges that she does have allotted time to spend away from the Underworld, but whether the allotment has changed since the time of the myths or Hades was somehow keeping her trapped there against her will isn't addressed.
  • Luke's plan in helping Percy get to the Underworld winds up sounding like nonsense on a multitude of levels:
    • To start with, Luke provides a map to a set of pearls that Percy and his friends can use to escape the Underworld once they're inside, without which getting out is said to be impossible. The pearls turn out to work exactly as advertised; however, true to the book, Luke later admits it was never his intention for Percy to leave the Underworld alive, begging the question of why he gave him the map in the first place. In the book, the pearls were actually a gift to Percy from Poseidon via a third party, hence why Luke hadn't factored them into his plan.
    • Luke sending the bolt along with Percy in secret is an even bigger example. In the book, Luke stole the bolt from Zeus, but was soon apprehended by Ares, whom he managed to convince to help start the war by passing it onto Percy, who would deliver it to Hades in the Underworld. (Luke's plan actually involved the bolt being delivered to Kronos via a pair of winged shoes that were cursed, but the movie also leaves that subplot out.) In the movie, Luke had the bolt with him the entire time up until he hid it in Percy's shield; there's no reason why he didn't keep it for himself as he intended to in the book, seeing as a war between the gods would've been of a large enough scale without Hades having it. Kronos being reintroduced in the sequel only further widens this plot hole, as the master bolt would've been a powerful tool for him and Luke essentially bartered it away for nothing.

    Sea of Monsters 
  • While it is more accurate to the book, Poseidon giving Percy the cold shoulder this time seems illogical given the less-aloof way their relationship was handled in the first movie, in which Poseidon provides aid to Percy several times and promises to stand by him no matter what. In the book, while he was grateful and proud of what Percy had done, he wouldn't become nearly as attached to him until much later in the series.
  • The second movie can't decide on which kinds of monsters can pass through the barrier and which ones can't. In the book, it was made explicit that no monsters could access camp unless a camper gave them verbal permission, as Annabeth had to do for Tyson, and the bronze bulls that attacked the camp were fought on the hillside outside the barrier as they were obviously not allowed in. The film adds in a caveat that Tyson could enter camp on his own, explaining it away as because he's a son of Poseidon, despite that being the case for all cyclopes (a fact the film acknowledges), including the ones who killed Thalia and were shown being repelled by the barrier.
  • Towards the end, the movie flip-flops on whether the story will have or need any further continuation after its conclusion. The early revival of Kronos means the terms of the prophecy have technically already been fulfilled, the fact that he swallowed Luke whole would seem to ruin any desire to try resurrecting him again, even if he manages to escape being eaten by Polyphemus...and yet after all of that is over, the movie still closes out with Thalia's revival and Percy realizing she could be the half-blood destined to fulfill the prophecy.