Anyone seen this movie? It is quite good, in all actuality. The violence is not really there; it shows his murders, and there is some blood (it was made as realistic as possible), but it was not over the top. There was a good amount of language, with pretty much every word in the book, including the 'f-bomb'. The murders might be a bit disturbing to some; the victim's screams, I'm sure, are not pleasant to hear.
The movie itself focuses more on the investigation and hunt for the Zodiac instead of the actual killings. At roughly 2 hours 45 minutes long, it might be too slow for some to enjoy. Regardless, there is not as much action as some might hope, but the effects the killings and the hunt for the Zoidac caused upon families is very well portrayed, and makes you understand the reasons this man went down in history.