One of the most difficult grids I've ever played. 0/10. I think you're overestimating us if you think this is an appropriate level at which to set them.

it's not about having more knowledge, it's about having different knowledge. any one of the iranian cities is probably of greater overall significance to the world than, say, the minutiae of london's traffic networks, which seems to appear quite often on this site. i know absolutely nothing about movies myself, but there's definitely a select bunch of answers that look like western surnames, to at least get the first round point by trial and error, and i'm under the impression that al pacino's characters are famous enough to not be too difficult to guess for the second round. the other two categories are very tough for the first round, sure. i'm not here to give everyone ten points for showing up. some strong deduction and probably a little luck is required for those. in the second round, though, while they're still not easy, they're not impossible. you only need to have heard of one of the gibbons to figure that one out, and i gave generous options for keywords - gibbon, ape, or just primate will do. i'd like to think that there are more than a few people around who know what a siamang is. brazilian chevrolets sounds like an extraordinarily specific category, but again i've given a lot of soft keyword options - one might reasonably surmise that they sound like car names, and indeed just putting 'car' will get you the point for that one. is the grid hard? absolutely. but i don't think it's unreasonable for a community of people who seek out quizzes for fun.