Alright, thanks. I'll try to fix them as soon as I can.
About the manager's dialogue, I'm afraid I don't know how to make it happen only once.

And weird, I guess I never saw that because I died before I could go back down.

And oh, I had that problem with the rings killing me on checkpoint, but I thought I fixed that.

edit
Okay, I fixed the glitches you told me about, except the manager one.