Okay, I've been trying to solve some inconsistencies found between WC3 and WoW involving Quel'thalas.
Elfgates
Considering there are two elfgates, one found before crossing the Elrendar River and one after, one elfgate must obviously be found in the Ghostlands and the other in northern Eversong Woods. Many people claim that Thalassian Pass was the first elfgate, but if that was the case, then the original lands of Quel'thalas must have extended into the Eastern Plaguelands as Arthas destroyed a High elven village prior to destroying the first elfgate. When it comes to the second elfgate, the only place I could see there being one that follows the Dead Scar would be that area between the two mountainous regions on the map, just below the text "The Dead Scar" (as seen here). If that's the case, then the elfgate must be longer than originally shown (which should be obvious due to gameplay limitations). The only problem would be that we don't see any remnants of this elfgate at all (much less the first one), and if there was a gate there, Arthas could have easily went through the Scorched Grove and head towards Silvermoon, passing between Sunsail Anchorage and Fairbreeze Village, instead of spending his time trying to get the Key of the Three Moons. Some people claim that the second elfgate is the original entrance to Silvermoon City (the giant broken doors that you can't access in game). However, in WC3, Arthas opens the second elfgate prior to entering Silvermoon proper, so I doubt this is the actual inner elfgate.
Deatholme and the Dead Scar
People claim that Deatholme was the original village that Arthas destroyed and built over to make a base. However, according to Lady Liadrin, Deatholme was built in the year 25, 5 years after the fall of Quel'thalas. Considering this, why does the Dead Scar start here? Even if Lady Liadrin's wrong and the fanbase is correct, why does the Dead Scar start here and not in Thalassian Pass? Maybe Arthas could have traversed over the mountain range, but if Lady Liadrin's correct, then wouldn't the Dead Scar extend . . . well . . . over the mountain range? Regardless, if Deatholme was Arthas' first base, then Thalassian Pass couldn't have been the first elfgate considering he would have had to destroy it prior to creating his base, which is contradictory to the WC3 Undead storyline.
Other
When it comes to Sylvanas destroying the bridge over the Elrendar River, I understand that "Path of Frost" probably was never even imagined at the time of WC3's inception. However, in WoW, there's a second bridge not too far from the Dead Scar. If they built a bridge after the Third War I can understand that. Nevertheless, there are roads leading to and from this bridge as well, and they're seemingly well established considering villages yet-to-be-reclaimed have footpaths leading to this main road. The only explanation I can think of is that Sylvanas and/or her cadre destroyed the one bridge that we can find in the MMO prior to her meeting with Arthas, and subsequently destroyed that bridge shown in WC3 as well. However, if this is the case, there seemingly aren't any roads that converge at this point for a bridge to even exist there. Even furthermore, considering the retcon of the Sunwell not being in Silvermoon (despite the fact that WC3 maps show it's supposed to be separate from the capital) and the Path of Frost being used to get to Quel'danas, it's irrelevant that Sylvanas even needed to destroy a bridge over the Elrendar River.
I'm probably missing a lot of other things I had going on in my head, but yeah . . .