One thing that is bugging me is that in buildings, there are frequently long hallways in rooms that dead end with nothing. No collectibles, doors, notable props, or anything. This is quite jarring, as in real life no one would build such a thing, so artificial man-made buildings in the game having such seems strange. OK, some of them you can write off as a hallway that used to have something at the end that got destroyed when whatever happened to the world happened, but that seems like it should be the exception, not the rule.
Please note I am talking about "hallways" in a single room, not multi room passages. Also, I am only talking about in man-made buildings. Naturally made caves and underground passages having such paths to nowhere makes sense, as these were not built with practicality in mind (in fact, they generally weren't built at all)