Continuity mistake: After Cindy says "I've known you for 5 minutes and I want you dead, too", there's a shot of Matrix's face and all the cars suddenly disappear, only to reappear a second later from a different angle. (00:30:40)
Continuity mistake: Matrix enters his home and a baddie holds a paper heart. The position of his hand differs between shots, notice the fingers on the second "D" and later on on the yellow paper. (00:13:30)
Continuity mistake: When the military guy leaves Matrix's house, the chopper's shadow points in a 12 o'clock direction. A frame later it's pointing to 3 o'clock. (00:11:25)
Continuity mistake: The yellow Porsche crashes on some dusty trail with no yellow lines painted on its floor. When Matrix walks towards the car, it's now by a yellow line on a paved road. (00:40:15)
Factual error: When Cindy approaches the security guard to report Matrix, the guard calls backup. There is no antenna on his radio. (00:34:20)
Continuity mistake: When Matrix and Cooke fight at the motel, the number and shape of broken glass-tiles on the wall keeps increasing / decreasing randomly in different shots. (00:46:25)
Answer: Director Mark Lester replaced Wings Hauser the first day of shooting because he didn't think Hauser clicked as a maniacal counterbalance to Schwarzenegger's larger-than-life portrayal of Matrix. Last-minute cast changes are not unusual when an actor fails to meet certain character expectations. A classic example is Michael J. Fox replacing Eric Stoltz in Back to the Future because Stoltz portrayed Marty too intensely for a humorous sci-fi film. Viggo Mortensen replaced Stuart Townsend as Aragorn in Lord of the Rings because Peter Jackson felt Townsend wasn't properly preparing for the role.
raywest ★
Also, Peter Jackson thought that Stuart Townsend was too young to play Aragorn.