At the end when they show the aerial shot of the burning car, you can see Assane kneeing next to the car - arms uncuffed. But just moments before you can see him getting cuffed behind his back by Lt Belkacem.
After Lèonard put Raoul in the trunk of the car he could have easily escaped because all modern cars have luminous trunk lid releases inside the trunk to prevent someone being accidentally trapped inside.
When Assane is chasing Léonard, some shots are flipped (note the license plates) to make it look like the cars are always driving from left to right.
In 23:28 a Mini Countryman is seen in the background, in a flashback from 1995. Mini Countryman was only launched in 2010.