Punchline - Der Knalleffekt

There is something not right about this movie. What is it? I don't know. It could be one, a few or all of many things:

Characterizations change by the minute, with flimsy and/or no explanation. It bounces back and forth and back again between slapstick, light-hearted comedy, gritty drama, and sappiness. It spends painful stretches focusing on comedy acts that are supposed to be funny (everyone on the screen thinks they are) but they really aren't. It runs far too long.

But at the same time, it's okay. Amusing at least, and it has it's decent moments, among the forgettable and awkward ones.