Character mistake: In her first walk through the city with Dr. Ido, after feeding the dog her sandwich, Alita takes a flyer and reads it. Between the lines that read "Wanted" and "Murder" there is a line in Spanish that says "Querido para el asesinato." It should say "Querido por el asesinato".
Continuity mistake: During the game, Alita disposes of the black cyborg guy with the yellow paint, the same one she met at Kansas. She rips his arm off and uses it to spike the head of the colossal dude with the morning star-like weapon. You could see as the arm was being ripped, that debris and a big metallic piece of scrap were left behind. However, when the 2 next opponents are skating towards Alita making her take off fast, there is no such trace of debris beside the whole body of the guy. (01:33:00)
Continuity mistake: Alita and Hugo are talking; he just told her clumsily that she's heavy, and asks to see her hand. You can see walk past Alita a group of punks, but the same punks are also checking out of the stalls behind Hugo, with their colored purple and green mohawks visible in the background. (00:11:55)
Plot hole: Grewishka sneak-attacks Alita using his weapon from outside the window. How in the world was the hulking behemoth just standing outside the window without Alita noticing? He surely couldn't have tiptoed into that spot after she arrived, he makes a ruckus for every step he takes. (01:47:10)
Other mistake: When Alita jumps on the table after breaking Zapan's nose, her right leg (left side of the camera) is missing. In the next shot, it reappears where it should be. (01:01:11)
Continuity mistake: Hugo is running away from Zapan; after the sequence of Alita's busted pipe we see him jump over a parapet onto a street underneath, rolling just past an incoming utility vehicle. In the overhead shot he lands right in front of a group of people including a rather conspicuous man with a pink shirt, but in the following shot almost everyone in the street is gone. (01:34:40)
Continuity mistake: During the sequence when Alita manages to get her revenge on Tanji, look when she is coming out of the curve with enough speed to be able to tackle him. In between shots the crowd behind the ramp has completely changed, with some bearded guy and a dude with a panama appearing out of nowhere, to mention just the most obvious. (00:19:40)
Continuity mistake: Ido and his ex-wife are walking on a relatively narrow bridge with stalls on one side. When she says "clearly" to him admitting he did not destroy the body, a man with a backpack literally disappears between shots as he was walking past a woman in a white and blue shirt. (00:16:00)
Continuity mistake: In the first part of the walk through the streets of Iron City, many times the various passersby disappear and appear between shots - just look at the first cut, and how a punk dude is suddenly in front of Alita while they fail to pass by the bicycle lady that was going towards them. (00:09:15)
Continuity mistake: Alita and Dr. Ido talk in front of the sign of his clinic, and he gives her a name; during the back and forth of their dialogue, the passersby do not transfer between any shot and their reverse angle: they simply disappear (unlike for instance what happens behind the nurse with a purple shirted guy who shows up coherently turning a corner). (00:08:50)
Continuity mistake: In Alita's speech inside the Kansas bar, at first she does not have her Hunter Warrior ID in her hand. After the camera angle change it's in her left hand and then her hand is empty once more after the next camera angle change.
Continuity mistake: In the battle with Grewishka and the other two murderous cyborgs, Ido loses his scythe that falls down with the sharp edge pointed towards his right. When Nyssiana disrobes, though, the scythe is turned the other way incorrectly, with the pointy end on the opposite side and the burner on the right. (00:28:15 - 00:29:00)
Continuity mistake: After Alita slides away from the Centurion, dog in hand, she freezes in the pose at the side of the road. To her left, witnessing the scene there's a woman wearing sandals and some rasta patterned pants. She is standing by the corner of the sidewalk, but when we see her after a brief reaction shot on Hugo, she is standing super close, literally in Alita's shadow (they both shifted away from the corner, technically). (00:11:15)
