I'm all for bringing lore into game mechanics. (It's a great example of how to RP mechanics.)
- NPCs walking through objects and people: [title]
- Repeating quests completed by other people and the respawn of mobs and (mini)bosses: [title]
- Zoning: [title]
- Demon Picts (Bat) running around randomly when aggroing: [title]
- Nobody ever cleaning up the horse poo quest helper in Old Tarantia: [title]
There's more, but I'm too tired. (I'd be more okay if it was because I didn't sleep from playing AoC, but sadly, it's only because I couldn't sleep when I tried.)