Continuity mistake: When Cameron Diaz is in the portal and Maxine is on top of John Malkovich on the couch, they keep on switching shots. One shot shows Maxine and John Malkovich and the couch, while the other is Diaz's view from inside Malkovich. The straps on Maxine's top are over her shoulder from Diaz's view, but they have slid down her arm from the other camera shot. (00:54:05)
Continuity mistake: When Craig is waiting at the New Jersey Turnpike roadside for Lotte, he is not wearing his glasses. When she falls down, from one shot to the next, he has them on again. (00:36:20)
Continuity mistake: When Maxine is having dinner at the Schwartz's the wine in Lotte's glass increases although no one has poured it. (00:50:05)
Continuity mistake: When Craig enters Maxine's office after he has been inside John Malkovich for the first time there's a coat hanging over the doorknob. It falls down as he enters, and he doesn't put it back. However, in the next shot, the coat is back hanging where it was. (00:31:10)
Continuity mistake: When Dr. Lester shares his fantasies with Craig while he's leaning on a filing cabinet, he's either talking with his left hand rested on his right arm (seen from the front) or with both hands held open (seen from behind). This changes several times. (00:17:30)
Continuity mistake: When the first customer comes and asks about what exactly is going to happen he breaks into tears in his low self-esteem. Then Maxine asks for the money, and from one shot to the next he is sitting straight, holding a paper with both hands. (00:47:30)
Continuity mistake: When John Malkovich goes into his own portal he suddenly is in a restaurant filled with himself. If you look closely you can easily see that instead of carefully using computer graphics and superimposing his head on all the other bodies they just used extras. They got lazy and it is very easily seen that many of the Malkovich's are just older men that are balding and have grey and dark hair. (01:07:25)
Continuity mistake: When Maxine and JM make love the second time he realizes that someone else is inside him. When he confronts her she is sitting on a sofa, her blouse partly buttoned and one leg over a pillow. When the camera angle changes her blouse is totally unbuttoned and the pillow is on her lap. (01:01:00)
Continuity mistake: When Maxine calls the newspaper to submit the ad for JM Corp., she is sitting either normally or with one foot on the chair and her knee above the table alternately. (00:40:25)
Continuity mistake: When Craig comes to Maxine's office to tell her about the portal, she wants to leave. She picks up her purse with her right hand, but when the camera angle changes she's holding it in her left hand. (00:31:15)
