Commissaire Gibert fires an LMC-X10 rocket launcher originally with 9 rockets. He only fires five rockets (the first through the window, the second hitting the safe, the third hitting the statue in front of the pool, and the fourth and fifth were fired in air and swirled to hit the second floor supports) but when he is done the rocket launcher is shown with three rockets remaining instead of four.
During the transport of Djibril Cisse, a police car crashes into a red truck. The position of the car relative to the red truck changes each time the accident is seen on camera.
Albert Vandenbosh initially put his black handkerchief in his left front suit pocket, but at one point, while firing the uzis over the balcony, it is shown in his right front pocket.
Pre-made cracks can be seen in the glass before Alain breaks it with the fly swatter.
As Emilien is slammed down to the floor during the final scene, in one shot, one of the tiles on the floor move, revealing it's made out of a soft material.
When Édouard Triboulet sees his brother (around the 01:03 mark), he calls him Fénimore, which is the recent alias he's used in the movie, not his real name: Albert Van den Bosch.