After protests from parents and politicians concerning some dialogue scenes, in January 2008 the FSK raised the rating from "Not under 6" to "Not under 12" (which actually does NOT avert children between 6 and 12 to see the film, they must just be accompanied by a parent or legal guardian).
The name Chayenne-Blue (one of the children appearing in the film) alludes to the names of German actor's Uwe Ochsenknecht's children Jimi-Blue and Chayenne Ochsenknecht.
At the end of the movie Ludo asks the waiting taxi drivers for a special service. When he rides with the last cab next to the others in the next scene, the first two drivers have changed their waiting positions.
In on of the scene in which Ludo and Anna are shown as kids, Anna opens a Coke can which content sprays in her face.
Based on the fact that Anna is called to be 29 in the movie the review might show her in the eighties. But the can with it's recent shape and opening seal hadn't been released in this time. The cans (in Germany) had a straight shape and seal which could have been torn off.