Moi, moi-même et Irène

The stunt where Jim Carrey (Charlie) throws himself out of the car was done in only one take.

Charlie's diagnosis of "advanced delusionary schizophrenia with involuntary narcissistic rage" is incorrect. Schizophrenia causes delusions and hallucinations with paranoia. Many people used to believe that schizophrenia resulted in multiple personalities, but this is not the case. He should have been diagnosed with dissociative identity disorder (also known as multiple personality disorder). Further, there is no medication used to treat multiple personalities, although some medications can be used for other symptoms (such as anxiety and depression) that accompany the condition. Treatment of DID involves years of psychotherapy - the disorder cannot be cured by taking a pill as portrayed in the film.

Under the credits, there are pictures of various featured extras identified by name.

TV versions replace all uses of "motherfucker" with "mamma-jamma."

Featured in Foo Fighters: Breakout (2000)