Clearly the person didn't run the code. The factorial function returns an int. The factorial of 13 is already too big for a 32-bit int. The factorial of 21 is bigger than a 64-bit int.
I found the scroll bars very frustrating. They are so small that I could not drag the bar around very easily (reminds me of default scroll bars in Ubuntu these days). The contrast is so bad between the part that is dragged and its background that it took me a few seconds to actually make out which is which. The contrast of some of the text being grey on a darker grey background in the right sidebar was hard on my eyes. That part wasn't as annoying to me as the scroll bars though.
I do like the idea of this. The functionality seems to be there.
I am similar to you (just over 10k rep). Often when I answer a question, it is a tougher one that others shun away from. I may put in some real work to help the person. However, because the the level of difficulty of the question is higher, the level of understanding of the voter also needs to be higher to know if he/she should vote for the answer. Of course, there are other factors like the narrowness of applicability to a more difficult question and the time taken to even read the question if it is a longer one.
Perhaps people will notice that it isn't just the California Highway Patrol that is doing this. Check out the Transportation, Justice, and Parks and Recreation agencies for instance. They may not always be quite as egregious, but they all have people who are receiving huge pay raises in one year from some 'Other' source.