Is there anything original in this movie? **spoilers**
Let's see, Harry congregates in a place similar to where all the taxi drivers hung out in Taxi Drivers.
His alcoholic rants are similar to Martin Sheen in Apocolypse Now.
His efforts are all to help save a prostitute, again like Taxi Driver.
He has somewhat obnoxious, uncomfortable dialogues with other characters while driving them around, much like how Robert De Niro crafted his character in Taxi Driver.
It even ended with a newspaper article about Harry much like Taxi Driver ended with an article about De Niro.
The only thing missing is an assassination plot on a political candidate.