None of that is all that unusual and I wouldn't have bothered mentioning them on those grounds. I have, however, been reading the reviews (I gave up on the actual stories very quickly), trying to work out what kind of people actually like that sort of fic, and I saw a couple of people picking up one of them on a glaring error.
He has Xander and Faith drive from Boston to California in 8 hours.
It's three thousand miles. Lewis Hamilton, in a Bugatti Veyron, with the roads closed to other traffic, would still be a thousand miles short at the end of 8 hours (even without allowing for the multiple refuelling stops that would be required, and assuming that he's been catheterised).
The author, in his reply to the first reviewer to point this out, says 'I do not live in america and so do not know how far boston is from california.' Dude. Please. Boston, East coast. California, West coast. The USA, pretty damn big. It should be blatantly obvious that you're not going to drive it in 8 hours. Google the distance. It's not rocket science.
Although rocket science is probably the only way of getting a car from Boston to Sunnydale in 8 hours.