There was a glaring mistake in the last episode.
When Martin/Moritz pulled into the filling station on the Belgian border to make the rendezvous with Lenora and have his blood taken, he put the petrol nozzle into the tank, and presumably left it to cut off when the tank was full.
When General Edel emerged from the toilet, and Martin rushed back to the car, he jumped in, had the brief conversation about the smell of smoke in the car, then pulled away without removing the petrol nozzle from the gas tank.
I thought that it would stretch, then snap, but as he turned away from the pumps the nozzle and hose were not there.
I even rewound the film to check, and it definitely was still in the tank as they both got in.