"The way I’d best describe Zodiac is almost as a documentary. The film makers went out of their way to make sure that the depiction of events was as close to the actual events as possible. You can see the attention to detail in the sets and clothing but most importantly, in the depiction of the crimes that the Zodiac killer is infamous for. Watching the special features, you see the efforts that they went through to make sure that nothing was left to chance, as they involved as many people connected to the case as possible.
All of the actors do a spectacular job, but particular attention should be given to Gyllenhaal and Ruffalo. They both hold the film together, and it’s their characters that we follow through most of the film. Robert Downey Jr plays the Robert Downey Jr character, which means he’s a sarcastic drunk who doesn’t play by the rules. You can look at this as a good or bad thing, depending on your opinion of Downey Jr. I took it as a good thing, as he brings some humor to an otherwise fairly bleak film. All in all, the entire cast does an extremely good job of bringing the time period to life".