I'm not the developer, but--did you check the terminal in the office? That helped me.
Yeah, it stinks it doesn't have a save. I was stuck around that area too (tho I had access to the outside of the theater); the other clue I got from other comments was a footprint outside of Alex's office. That and making sure I'd asked the vagrant all I could. If you ever go back and play it again, hope this helps!