Continuity mistake: The Audi car is missing its W12 logo in the grill in one shot. In different scenes with the Audi, there are two different number plates at the front (at least where the number plate were supposed to be: one with two "holes" at the lower end, and one without. Obvious that there were 2 different cars used.
Continuity mistake: When "Lola" (the lingerie-clad assassin) forces her way into Frank's car and makes him drive at gunpoint, her heavy black eye makeup is smeared under her eyes. Throughout the scene it changes from being a very wide smudge to just being a little smudged under her eyes.
Add timeCal K.
Continuity mistake: At the doctor's office, Lola shoots up a police car, damaging the passenger doors, and destroying the light bar on top, then steals the car. When arriving at Audrey's house, to get into Frank's car and kidnap the kid, the police car she is driving has an intact light bar on top. When Frank leaves the driveway, and accelerates away, the police car is hit, but once again the light bar is shot up, and there are bullet holes in the passenger side doors.
Continuity mistake: In the scene where Frank's fighting the guards with the fire hose, one of the last guys to attack him (in a red shirt) runs up very close to the Frank, who then backs away maybe 5 feet. In the next shot that same person with the red shirt is now about 15 feet away and charging toward Frank.
Continuity mistake: Dimitri gets angry at Sonavitch and strikes him across the nose, cutting Sonavitch, and causes him to bleed. The blood only stays on his face, with none of the blood getting on that white lab coat he is wearing. Eventually Frank shows up and throws a knife, which he picks up from a table, into Sonavitch's left leg, as Sonavitch is trying to flee. All of a sudden there is blood on the white lab coat.
Continuity mistake: Some guy puts a bomb under Franks car because they managed to escape, yet when he escapes from the cops (with Lola in the car), the bomb isn't there. A while later when the kid has been dragged out of the car, he looks under it, and sees the bomb's reflection in the floor.
Continuity mistake: When Frank is arriving at the school to pick up Jack at the beginning of the movie it shows him pulling up to the school and there are no other cars parked on that side of the street. When it cuts to show him sitting in the car waiting, there is a car parked behind him. When it cuts to outside again, there is no car behind him.
Continuity mistake: When Frank finds Dimitri at his residence, Dimitri is wearing two bracelets - a chunky one (closer to his hand) and a thinner link - on his right wrist. Either both disappear and reappear or one disappears and reappears or they switch positions, such as when he is hanging onto the back of the moving bus. The pinky ring on his left hand also performs a vanishing act.
Continuity mistake: Frank goes back to building where the pediatrician's office is located, finds the security camera video and snaps the overhead photo of Dimitri looking over his left shoulder to face the camera. When Frank sends the photo to Inspector Tarconi, who is at the US Marshal offices, the photo of Dimitri is entirely different.
Continuity mistake: At the start in the garage before the attempted carjacking, there is a W12 emblem to the left of the Audi logo on the car's front grille, which then disappears and reappears dozens of times in the following shots. Additionally, when the W12 emblem reappears, bizarrely it is either aligned with the Audi logo at its center or at its bottom bar.