Continuity: On the soccer field before Viola reveals she is a girl, her sideburns change position between shots.
Continuity: After Viola takes her wig off in front of the crowd her hair goes from messy to perfectly straight between shots.
Revealing mistakes: When Viola walks into the tent to talk to her mother at the carnival, there is a wooden pot with sticks in it, in one scene its directly behind Viola, the camera then changes to the mother and when they go back to Viola the pot is then at least 5 meters behind her and there is a clown behind her too.
Errors in geography: When Viola is following various men to imitate their walks, a magazine stand for Dose is clearly visible. This is a Canadian magazine which was only available in Vancouver, Calgary, Edmonton, Ottowa, Toronto, and Montreal.
Anachronisms: If Viola is only covering for her brother, as soon as she was found to be playing for Illyria , they would have to forfeit the game for playing an ineligible player.
Factual errors: In reality, débutante escorts are chosen almost eight months in advance and there are teas and manners sessions throughout those eight months. There is no way that the characters could have switched escorts so late in the story and Viola would have never been able to be an actual débutante without successfully fulfilling her year-long requirements. The movie shows her joining the débutante process two weeks before the ball.
Continuity: In the game against Cornwall, Illyria kick off at the start of both the first and second halves instead of alternating.
Factual errors: After one of the teams scores a goal in the final soccer game, they are seen putting the ball back into play by way of corner kick; In a real game of soccer, after one team scores a goal, the other team puts it back into play with a kick-off: Kicking the ball from the center spot on the field, used to start the game and the second half.
Factual errors: At the end of the game there is no final whistle. If the PK was in the last seconds, the goal wouldn't have counted because the game would have ended as soon as the goalie saved the ball.
Continuity: Near the beginning of the film, when we first meet Monique, and she thinks Viola is Sebastian, Viola turns around and her ear is sticking out through her hair. The next shot is of the back of her head, and her ear is slightly covered up, but still visible. The next shot is her face, and you can just make it out if you look closely. In the next shot, again of the back of her head, her ear is totally covered up with her hair.
Continuity: When Viola/Sebastian and Duke are in the gym, the Coach comes up to give viola/Sebastian his jersey for the Cornwall game. In the next shots Viola/Sebastian doesn't have the jersey any more.
Continuity: When the Illyria team marches out on to the field at the Cornwall and Illyria game, Duke is holding a flag in his right hand, in the next shot the flag is in his left hand.
Continuity: After Olivia makes a date with Duke in the workout room, Viola (Sebastian) follows Olivia outside. When they sit down on the bleachers to talk, the shadow behind them changes in between shots.
Continuity: At the lunch table, Duke is holding a straw in one scene, and then in the next, he doesn't, and it reappears in the next scene.
Continuity: After Malcolm gives Olivia his flyer for his missing tarantula, he walks away and gives more people the flyer and keeps going. In the next scene, he is back where he was before, giving the same people another flyer.
Continuity: In the gym when Olivia and Duke are talking, Viola is behind them, looking at Duke's back, and then in the next scene she is in front of them and you can see Olivia and Duke behind her. It switches throughout the gym scenes.
Continuity: When Viola's mother is pushing through the crowd at the carnival, at first you see her back and she pushes all the way to the front, and then you see her from the front and she is still behind multiple people. Not only that, the crowd changes and it's different people.
Continuity: In the scene when Sebastian first leaves the head master's office and bumps into Olivia, all her stuff falls on the floor. When they are picking the stuff up the black folder is on top but when the head master goes back into his office Sebastian picks up the black folder off the floor.
Continuity: In the Cornwall/Illyria game when Justin and Duke are standing with the refs, Justin doesn't have a glove on his right hand, but when he backs off and asks Duke how is jaw is, he suddenly has a glove on his right hand.
Continuity: When Viola/Sebastian just went to her/his dorm for the first time she/he puts all her/his stuff down on the bed including the soccer ball. Then when the guys see the tampons fall out of her/his boot, you can see that there is no soccer ball on the bed behind Viola/Sebastian.
Revealing mistakes: When Viola tells everyone that she isn't her brother, she takes the wig off and its in her hand when she is moving her hair, but in the next scene it's not there.
Continuity: When Viola is being Sebastian, and she is sitting at the lunch table with the other guys there is an apple juice bottle and a Pepsi bottle. The apple juice bottle moves to various spots through out the lunch scene.
Errors made by characters (possibly deliberate errors by the filmmakers): When Viola's mother keeps showing her débutante dresses she shows her some in pink, although she knew Viola had to wear a white dress.
Crew or equipment visible: In the first soccer practice when Viola is running through the ladders/pylons, a person running with a camera is visible in a shadow.
Continuity: In the part where Duke is mad at Sebastian for kissing Olivia, he throws his pen onto the desk. Seconds later, the pen is back in his hand and he is seen throwing it again.
Continuity: In the carnival scene when Justin and Duke are fighting, the tip of Justin's underwear can be seen over his pants. It changes from white to black, and then back again to white in between shots. It is pointed out in the pop-up trivia version that his stunt double was wearing black underwear.
Continuity: When Justin and Viola are talking at the carnival, Justin's collar switches from popped to un-popped between shots.
Continuity: When Duke, Sebastian, Andrew, and Toby are choosing lab partners, Duke and Sebastian grab slips of paper out of the jar and they both hand Andrew one.
Continuity: Cornwall won the toss and stayed in the goal with the side of their supporters, however in the second half when Cornwall scores a goal, Justin takes a flip off the goal post and the Cornwall supporters are seen cheering behind him! Illyria supporters should have been seen since the goals would have changed in the second half. Later on in the movie when Duke and Justin are about to fight, Justin is on the goal side with the Illyria supporters.
Continuity: In the scene when Sebastian/Viola is in the headmaster office, when headmaster Gold shows the red and black school colors, Sebastian/Viola takes her arm away twice.
Continuity: In the middle of the game, the paint on Sebastian’s face is smudged but then when it shows him again, it's not smudged (only faded).
Audio/visual unsynchronized: When Olivia is talking to Duke in the weight room she says 225 we see her say it, but then the camera moves behind her and we can see her mouth the word five but don't hear it.
Continuity: During the first soccer game, Viola's face paint is smudged in one shot, then in the next, the smudge is gone.
Continuity: When they're in the lab, Viola and Olivia's experiment spills over, making a large puddle. When the camera goes back to them, the puddle is much smaller.
Continuity: After Viola breaks up with Justin she throws the ball at his head and you can see that it hits him and he tilts his head backwards, but when the camera changes view his he is straight back up and it is clear that these are shot at different times
Continuity: In the débutante scene, Viola and Duke are kissing. First his hand is straight down, hanging along his side. Then the picture switches for one second and his hand is around her neck. Her arms go from being at her side or somewhere around there to wrapped around him as well.
Audio/visual unsynchronized: When Duke parks his Ducati 999, the sound of the bike is a four cylinders instead of a 2-cylinder sound
Miscellaneous: When Viola is playing in the Cornwall game, right before she reveals she's a girl, it is obvious that she doesn't have her fake eyebrows on. When she reveals she's a girl, you can see her taking the fake eyebrows off.
Continuity: Duke's hair length does not match the chronology of the movie. This is discussed in the actor commentary.
Continuity: In the carnival scene when Viola is changing into Sebastian, you can clearly see that the small girl that Sebastian's side burn got stuck to isn't in the car on the tilt-a-whirl until the very end of the scene, so how could she have gotten on in the middle of the ride?
Continuity:Amanda Bynes' hair color changes throughout the movie. At the beginning it's a lighter brown with blonde highlights and later in the movie it is a darker brown. The color switches back and forth between the two throughout the movie.
Continuity: When Viola acts as Sebastion, she must wear an ace bandage to hind the fact that she has boobs. However when she reveals the fact that she is a girl at the Cornwall/Illyria soccer game, she lifts up her shirt to show that she has boobs to prove she is a girl, but there is no ace bandage.
Continuity: When Viola comes out from under the bleachers at the Cornwall/Illyria game, where did she get the red and black faded face paint?