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Answer: Yes Evan did write that single entry but this time he was at a disadvantage because in this new reality the younger him had already started the blame game of blaming himself and showing symptoms of being in trauma due to which he was institutionalized that same day the incident in the basement happened. Now about that single entry that he wrote before going to meet Kayleigh's dad, it is shown that in this particular reality as he did not maintain a proper journal after that, it got lost and everybody thought he never even started writing it before the basement incident happened leading to everyone believing there is no journal. This explanation is supported by an incident in the movie where the teenage Evan is making a journal at his attic right after his blackout with the blockbuster and Larry being admitted where he finds a box with his grandfather's death certificate and some weird photos in that attic. Later when he is institutionalized and asks for the journals from the doctor the doctor also tells him how his father kept asking for a photo album, suggesting his father also ended up in that institution by jumping realities and ending up in one where his photo got lost and he couldn't reach them anymore (the same photos Evan had found earlier in that attic). So his father got stuck in that institution and he didn't even have a of his birth like Evan did. Unlike his father, Evan got the video of his birth where he was able to stop himself from being born just like his two earlier brothers who reached the same conclusion and were shown in the movie as still births.

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Chosen answer: The time that Evan goes back and saves the dog, she gets hit in a different way and her cheek is split open - hence the scar. In the "original" timeline, she got hit in the head, not the cheek.

Paul Plesser

Answer: They are not making an educated guess at all. In the original timeline, her brother struck her in the side of the head, she still bled and was injured but no visible scar. In the altered "blackout" timeline when he goes back and tries to save everything/fix it, somehow it shows Kayleigh getting hit in a different spot. When her brother swung, it smacked her in the side of the face instead of the head, splitting her cheek wide open, leaving a visible injury/scar later on. It was most definitely, 100% shown to the audience, when her brother struck her differently. Lol.

Answer: First of all you need to remember that this sequence started right after Evan makes that big scene by using some sharp object on those two criminal brothers in prison to get his journals back from them. Now later when Evan is able to save the dog, he wakes up in his bed and starts bleeding as a repercussion from storing all those years of memory of this new reality at once, but the flashes that are shown when he wakes up are actually the flashes about how the reality changed after he saved the dog and Kayleigh's brother dies instead. In one of those scene it is shown that the grown up mentally disturbed Kayleigh asks for a lift and those same two criminal brothers are shown in the car she gets inside. So we can assume that the line of business she is shown in later and those scars she has is actually due to her getting along with the wrong people.

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