The movie changes the ending by letting Noah and Allie end up together whereas in the book Allie forgets about Noah.
The film skips key moments and subplots which reduces the importance of the book’s dark themes.
The film’s ending felt overly dramatic and less impactful, with Anna not dying like in the book's heart-breaking twist.
The movie skips the details of Henry's time traveling, losing the book’s complexity which made it engaging, especially the emotional moments.
The movie rushes through Rachel's past and her unreliable narrative, missing the book’s focus into her alcoholism and emotional struggles.
The movie alters the book's mystery, cutting out important details which makes the plot feel rushed and less intellectual.
The film changes Jack’s character, making him evil from the start, whereas in the book, he slowly grows into the madness that is much more terrifying.
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