That's his character might not remember it. Dieter (or Didi as he's known in Germany) Hallervorden is a talented actor and he pulls off this role, which is a touch one to pull off. Is it unrealistic and does the movie draw too many cheap jokes? Yes it does, but with Hallervorden in the middle of it, acting his way out, even when you think it's impossible to salvage anything from what is happening, you can forgive such things.
The girl (daughter of Schweiger) is better in this, than she was in previous roles she got through her father. That doesn't mean she evolved into an actress yet, but let's give her the benefit of doubt and maybe she'll manage (some would argue, that it won't be hard to overshadow any "acting talent" her father has, but that's a different story). If you don't mind how over the top this is and how silly most of it is, it actually kind of works (which surprised me a little bit)
The girl (daughter of Schweiger) is better in this, than she was in previous roles she got through her father. That doesn't mean she evolved into an actress yet, but let's give her the benefit of doubt and maybe she'll manage (some would argue, that it won't be hard to overshadow any "acting talent" her father has, but that's a different story). If you don't mind how over the top this is and how silly most of it is, it actually kind of works (which surprised me a little bit)