Didnt know where else to post this, but here are two links I found very useful for this competition and I think some of the other users will too
Internet movie car database - identifies A LOT of cars from movies (both important and random cars in the environment)
IMCDb.org: Home page
And also a site for weapons that does the exact same thing:
Main Page - imfdb :. guns in movies :. movie guns :. the internet movie firearms database