Continuity mistake: When Pascal's henchmen infiltrate Buckingham Palace, and force the Queen to abdicate, if you look very closely on the abdication document it is dated the twentieth of March 2003. Yet in an earlier scene where Johnny English is photographed by the speed camera that has the date 21/03/03, obviously the abdication was filmed before the car chase, and therefore the dates get mixed up.
Continuity mistake: When Natalie Imbruglia and Rowan Atkinson are trying to enter John Malkovich's "chateau", when Natalie is climbing a ladder a tattoo is visible on her lower back. Later, when Pascal Sauvage (Malkovich) is being crowned, Natalie is seen fighting a sniper on the upper-level of the church. When the sniper pushes her away, the tattoo on her lower back is gone.
Continuity mistake: The first time the film of Johnny in the mirror is shown, look at the toothpaste in the bottom right corner. First you see the Aquafresh, then it cuts to Sauvage, and when it cuts back the toothpaste tube has moved. Then it cuts away and back again, and the toothbrush has moved in front of it.
Continuity mistake: When Bough is telling Johnny and Pegasus about the two criminals working for Sauvage, he calls Vendetta "Klaus", and indeed, the screen in front of them shows this. However, the end credits put his name as "Carlos".
Continuity mistake: When the foreign secretary smacks Johnny English in the face after he poured his glass of champagne over her at Sauvage's reception, you can see a Chinese man and a woman standing by the door looking at the incident, but in the next scene when Lorna catches Johnny, the Chinese man is seen talking to the woman next to him.
Continuity mistake: When Pascal Savage is examining his family tree on the table, the tree can be seen when he tries the hat on. Then the scene cuts to the Archbishop. After this when the scene cuts back to Pascal Savage the family tree sheet is nowhere to be seen. (00:29:45)
Continuity mistake: When the congregation gasp in horror at seeing the Archbishop of Canterbury's bottom at Sauvage's Coronation, you can see in a wide shot of the congregation a woman wearing a white hat and she is putting her hand to her mouth. When we see a close-up of the woman in the next shot, she puts her hand to her mouth for a second time.
Continuity mistake: When Johnny is in the hospital, a doctor comes out of his office and is joined by two nurses who stand behind him, but in the next shot the nurses are now in front of the doctor.
Continuity mistake: When Johnny meets Lorna in the Tower of London for the first time, we see a close up of Johnny's face and Lorna can be seen taking a sip of her champagne. In the next scene, the glass is away from her mouth and she is taking a sip of her champagne for a second time.
Continuity mistake: When Johnny English and Bough watch Klein and Vendetta escape in the funeral hearse, Bough asks Johnny what they should do, to which Johnny replies, "Watch and learn, Bough". At this point, you can see that Johnny's face is dirty, but when he is driving the truck a few shots later, his face appears completely clean.