1) All the employees look sad, all he time.
2) They've obviously carefully tuned their check out staffing so that the lines are always long. This is such a constant that it has to be intentional, and they're doing a good job of it.
3) Sometimes they attempt to check receipts at exit. I don't get that at any other non-membership store.
4) All the shoppers look sad.
5) It's the only place I know where I am 100% guaranteed to smell both strong cigarette odor and way too-strong perfume application multiple times per visit.
6) The shoppers are uniquely talentless when it comes to existing in space without being in others' way. I don't see this anywhere else. It always feels 3x as busy as it is both because they cram the aisles full of crap, and because no-one knows how to walk or stand without being in the way. It's bizarre.
7) The most prominently-placed thing on entering the building is a row of gambling machines. I shit you not. They're directly ahead, and you have to veer right to enter the actual shopping area. That definitely sets a tone.
Most of these are true at any other Wal-Mart I visit. I avoid them most of the time, despite their having much lower prices than, say, target. The visits take longer and are miserable. Their weird interior color choices (WTF is up with that dirty-looking orangey-yellow?!) and something they do with the lighting (can't put my finger on it, it's just drab and dingy) make it even worse.
I'm about 90% sure that Wal-Mart didn't used to be this gross and unpleasant.