I tried making a thread of the differences once. Viper confused it for a bug report/complaint and locked it.
Most of the differences are 'bugs' that are fixed in this version, like sentry totem allowing you to float mid-air.
Some of the differences are things that just got changed or added along the way. Like the addition of raid symbol markers to the game (skull triangle circle, etc.) Really fun to do Garr without those in the game. Or when they added the mechanic of raid bosses putting the entire instance in combat (so you couldn't have 1 person stay out of the boss fight and rez people who died.)
There's also some stuff Nost just didn't replicate, for whatever reason, like black lotus being BOP, or the period of time when flasks didn't persist through death. Oh, and I'm pretty sure jujus should be horde only until like 1.11