Quote Originally Posted by Lone Wolf Leonhart View Post
Auronlu's House of Sin - Final Fantasy VII Recap, Ep. II: Cloud Hears Voices

Found this. Here's an excerpt.

Quote Originally Posted by Translated from the Final Fantasy VII Ultimania Omega
(Page 68) As Cloud is trying to place the bomb, a mysterious voice speaks to him. Later, this same kind of mysterious voice resounds in Cloud’s head in the scene where he and a voice have a conversation, and it offers him reminders. These voices are the original Cloud, as — due to Hojo’s Sephiroth Clones experiment — Zack’s personality merged with his, creating the present day Cloud, producing a conflict of multiple personalities(—>P.11).

During the scene in the first mako reactor, what [the voice] says is it [trying] to point [Cloud] toward the memory of Sephiroth five years ago in Nibelheim’s mako reactor, as the two places were similar. However, Cloud is not able to listen to the words of the memory.
What I'm definitely getting at here is that the original Cloud has been at the Honeybee Inn before. Specifically in that room. That's why he freaks out and hears the voice. He isn't well liked, that's why the lady says "Poo, I mean, uh, sir" upon seeing him. She really isn't pleased to see him. Also, he clearly has a history with Mukki. Everything makes sense now.