Other mistake: When Jean looks at Patrick's increasingly twisted designs, it turns out that he drew a woman with a chainsaw stuck in her back on November 13th. That does not appear to make sense by the most basic movie inner logic (even if we discount any real-life reference to the year), considering he murdered Paul on December 20th and his descent into madness isn't supposed to be a slow one. (01:34:00)
LorgSkyegon
27th Jan 2026
American Psycho (2000)
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Suggested correction: Just because he doodled the chainsaw on a specific date doesn't mean he killed her on that date.
It would have been quite strange if he just happened to draw a prediction of the murder months earlier, and it wouldn't make sense that he would keep a normal diary until September, then go crazy for months after but keep doodling in November of an old diary that he should have already filled (the movie is supposed to be well into the new year) but only from a certain point and in a crescendo. Julia... ahem, Jean didn't just find a scrapbook of insanity; she found the diary of his increasing spiral into insanity.