The mumbling dialogue was inaudible, but I found that to be funny. The sound aspect that bothered me the most was the echo of the other actor's dialogue - it sounded like you shot it in an average break room in an average building, a room that was not constructed with sound recording in mind. Not a whole lot you can do about that in post besides ADR. I think Adobe has noise filters, but I'm not sure how good they are.
Poke