About fifteen or twenty years ago, I was discussing The Empire Strikes Back with my brother and some of his friends. (All the participants were huge Star Wars fans, and my brother and his friends were active players of the Star Wars role-playing game at the time.) I mentioned how the rebels escaping from Hoth used their ion cannon to disable the star destroyer that was in their flight path. Somebody (my brother or one of his friends, I don't recall) said, "Oh, that's the Avenger," and they showed me a source that agreed with that (a manual from the RPG, I think).
My response was that that almost certainly wasn't right. The Avenger is the only star destroyer named in dialogue in Empire, but it's clear from the context ("Sir, we have a priority signal from the star destroyer Avenger.") that the Avenger is the ship that locates the Millennium Falcon when it leaves the asteroid field. We later see what ship that is, as it's chasing after the Falcon; it's Captain Needa's ship.
Since we saw who the captain of the disabled ship was, and it wasn't Needa, this strongly suggests that the disabled ship was not the Avenger. (It doesn't make it impossible, but all evidence militates against the identification of the Avenger as that ship.) So where did the idea that that was the Avenger originate? Was it just sloppy work on the part of some extended universe writer, or what?