● Before shooting a dance scene in the film, director Jean-Marc Vallée did not tell Jacob Benjamin Gyllenhaal which day the scene was going to be filmed. When it was time to shoot, the director directly plugged Jack's iPod and shouted to start. So Jack was as surprised as the character's reaction in the plot, and he could only wrestle on the carriage with his headphones on
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●During the filming process, director Jean-Marc Vallée felt that the missing parts should be smashed, and would smash the hammer by himself
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●Because of the plot needs, the film has a lot of beating and smashing scenes. During the shooting, half of the room was specially repaired for filming and smashing scenes
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