The furniture line is clearly tied to the direct quote that follows it ("Rincewind tried to force the memory out of his mind, but it was rather enjoying itself there, terrorizing the other occupants and kicking over the furniture.") as well as the introduction sentence that preceeds it. As a sentence it works since it's part of a metaphor that is even tied to a line of Pratchett's own.

However, I don't think the rest of the post supports the Pratchett-as-expert-on-memories bit of that little aside, so it could be critiqued for not being followed up on or further supported. It's not a "make an argument for Pratchett as an expert on memory" post, it's a "tell a story of his writing connecting with me" post, in which case, meh.

But apparently the post was edited again, and "The Author, refusing to let the Narrator off the hook" is gone (along with some other things), which is a bummer as it seems like one of the most Pratchett-like of the attempts. In context I don't think it works, but generally it fits well with Pratchett's writing style and his relationship with his protagonists.