Factual error: When Ray leaves his wife Gina and his car is hit by the truck he should still be in England, but when he is being chased through the streets he is in South Africa, the cops in the car are not in English police uniforms or vehicle, police livery is incorrect, and all vehicles have South Africa plates, not English number plates.
Continuity mistake: The protagonist, Neil and Kat are in the back of the yellow ambulance in the parking garage. Neil checks on Kat, after that he removes plastic gloves from his hands and throws them into the trash right next to him, 2 cuts later he again crumples a pair of plastic gloves. (01:46:15)
Deliberate mistake: When the kids are about to jump start the trap Phoebe hides behind the school bus door. Half a second later, when the trap opens, she's nowhere to be seen, not even jumping or stepping inside the bus. Then half a second later she has managed to get inside, turn around and protect her head while the bus windows burst. It all happens in real time for their hairs are still fluttering. It sure paces up the scene, but it's really awkward.
Continuity mistake: When Cecilia is talking to Adrian at the dinner table towards the end of the movie, the food on the plate is situated differently from shot to shot as they converse.
Character mistake: The Rufus hologram states that he first brought the phone booth to the Chosen Ones (Bill and Ted) in 1989, referencing events of the original film. While that was the year the first movie came out, it took place in 1988 (indicated by the opening title card and dialogue throughout the movie).
Continuity mistake: At the market, Lee picks out five pieces of fruit (one apple and four oranges?), tears a produce bag off, and walks away. He takes a few steps off-screen, and he is next seen going around an end cap and walking down an aisle, with nine pieces of fruit in the produce bag. (00:01:36)
Continuity mistake: The direction of the desk lamp's flexible neck varies with the camera's angle. Front views of Rodger show the top of the neck aimed toward the outer edge (length) of the desk and rear views of Rodger show the top of the desk lamp's neck pointed toward him sitting at the desk. (01:02:00)
Revealing mistake: In the car (and while it was raining), Jenna put on her sunglasses a little before Joe "exploded", suggesting she was preparing for the blood splattering. [Interestingly, Jenna put on the windshield wipers because she couldn't see out to drive, but the wipers were useless in that the blood was on the INSIDE of the windows!]. (00:31:45)
Continuity mistake: Within a scene, Xanthe's disheveled hair often has a different number of curls/waves (especially on the sides) and the tightness/ looseness varies. Sometimes some strands of curls look like loops sticking out sideways; sometimes her hair looks almost straight on one side. The nature of the curls may vary with front and back views at times. In one scene, she had about three loose waves on the left side of her hair then suddenly it looked almost braided (many waves). (00:07:21 - 00:07:51)
Other mistake: "Sally" the Great White Shark rammed Emma into a rock (or other hard object) underwater and Emma only got a small cut above her right elbow. It isn't clear how fast Sally was swimming, but Emma was rammed with force (and appeared to hit her back). A female Great White Shark weighs about 4,000 or 5,000 pounds, so Emma would be expected to suffer a major (not minor) injury under the circumstances. (00:05:24)