All stunts were performed by the actors.
A day's production generally went thus: an hour drive to location, half hour to an hour's walk to set, half hour to an hour of make-up, half hour of rehearsal, ten minutes or less of shot set ups, two-three hours of shooting, half hour to hour's walk back. It was this schedule that required a few re-shoots.
The flashback scene between Drake and Xan was added after principal shooting was finished. The writers felt a back-story was necessary.
Xan holds a magazine referring to a 'Naughty Dog' name.
All flies were real, but the sounds were foley.