Revealing mistake: When Simone is performing in concert, the auditorium is supposed to be packed full. But when the camera flies over the audience, in the background you can see empty space because only about 100 extras were recruited for the audience. (01:04:00)
Continuity mistake: When Viktor stands in his studio and replays the message Simone was supposed to say at the oscars (in which she thanks him), but didn't, the position of the papers, CD discs and other items scattered all over the floor, differs between shots. (01:11:20)
Continuity mistake: When Nicole kisses Viktor during the casting session, watch her hand. It's on the side of his face, initially with her thumb in front of his ear and her fingers behind, but then in some subsequent shots one or two fingers are in front of his ear. (01:13:30)
Continuity mistake: When Elaine is round Viktors beachhouse, they kiss and confess they want each other back, and then Viktor tells Elaine that Simone is a simulation etc., and in the background on a small wooden drawer is Viktor's Jack Daniels bottle, his glass and some champagne glasses. Yet when Elaine gets up, and says to Viktor "She made you", you can see the small glass behind them on the drawer, but the JD bottle and champagne glasses aren't there and they should be there in the shot. In addition, during this whole scene, the red lamp on the small desk behind them moves from sitting on the left, to the right hand side of the small wooden desk a few times throughout. (01:22:15)
Continuity mistake: Viktor puts the virus disk, a 5-1/4" floppy disk, into a 5-1/4" floppy disk drive; but when Lainey ejects that same disk, the disk is ejected from a completely different computer, one that doesn't even HAVE a 5-1/4" floppy disk drive. The disk ejects through the millimeter-sized crack between the blank filler plate for a drive bay and the edge of the computer case; it could not possibly have been read in that position, and no motor can exist there to eject it in that way. (01:32:49)
Continuity mistake: When Viktor has been arrested for "murdering" Simone, he is in a room with a man who walks between two peg-lines, with magazines and posters featuring Simone on them, pegged up. Between shots the magazines pegged up change, ie. When the man walks along in a closeup saying "This is fake, fake, fake, fake, fake..", he walks past a big poster of Simone standing, posing in a leather suit, and to the viewers right of this poster, a magazine called "Variety" and then next to that a magazine called "Simone" are pegged up. Then when it cuts to a wideshot, these two magazines are totally different ones, as you can tell by the front cover picture / layout / text etc. Other magazines change and move around too. (01:34:20)
Continuity mistake: When Viktor is talking to Simone, sipping his Jack Daniels he sets it down and the label is pointing away from him - the next shot the label is pointing towards him.
Revealing mistake: Near the end of the movie, Al Pacino has been arrested and is in a cage. When he demands to be let out, he grabs the cage and it wobbles, showing it's not fixed to the ground.
Continuity mistake: At the end of the movie we see Viktor sitting on the couch with Simone. Watch closely at the very end, he puts his hand directly on the couch. This would have caused it to appear to the audience to go through Simone's leg.