At least in the German release DVD with optional German/English soundtrack, there is an end credit in German stating June and Max were imprisoned for life. However, Max was stabbed to death in the movie.
Katie is hitchhiking by the stop sign at the rest stop slipway. She starts to walk towards the RV before Max and June have even stopped, like she already knows they are going to pick her up.
A couple of times as Max and June spot a hitchhiker, they argue if they are going to stop. Considering they are doing maybe 40 mph, they would go way past the intended victim.
Max and June abandon their RV and make their way to the highway to hitchhike. The Sun rises in the horizon from right to left, which can't happen in the northern hemisphere.