It's mostly a debate whether the love fool /pity works right outside the Naxx entrance or not. Some say it does, if you summon the Love fool so it appears to be on the other side of the entrance portal, others say that you can be summoned in the instance by a warlock (this i checked, and it doesn't work on Icecrown realm).
The thing is, I was trying to go for the [What A Long, Strange Trip It's Been] achievement with one of my mates, to get the Violet proto-drake. It would have been awesome to have that mount as a lvl 79 twink.
If anyone has a solution to this, it would be nice.. otherwise it's kind of a bummer that we have to abandon our journey for the mount, because of this silly detail :(