The Butterfly Effect

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• Movie Goof (continuity error): When Evan's mom is having a miscarriage, the doctor removes the pillow from under her head, the next shot it's there again and then disappears in the next.
• Movie Goof (revealing mistake): When Evan and his mother visit the fortuneteller in the Director's Cut, she says that Evan has no "lifeline" and should therefore not exist. In the scene that follows where Evan and his mother sit outside the fortune-teller's Evan's "lifeline" is clearly visible in his palm.
• Movie Goof (audio/visual unsynchronized): When Evan is in the wheelchair and talks to Kayleigh, his face is desaturated (see commentary track Director's Cut DVD). The effect is visible when people pass behind Evan. Their skin-tone changes when they walk through that desaturated part of the image.
• Movie Goof (continuity error): When Evan's mother takes him to the psychiatrist to be hypnotized (after the mailbox incident) the blood on his face changes many times between shots.