One of the reasons for this flashback show in the middle of the season was to allow the make-up team time to figure out to depict Ronnie's facial disfigurement, following an act of violence that had occurred to him in episode 2x7 "Barnstormers".
The crew members featured in the Barn in the episode 'Co-Pilot' putting it together are the actual setup crew members that put it together when they first filmed the pilot in the original church.
In season 2 DVD feature directing round table Paris Barclay and Scott Brazil discussing a scene where they filmed the carousel scenes of the man throwing up, that was a real clown worker that happened to get into the scenes of Vic and Shane listening to the wiretap.
This is a flashback episode, going back to the formative days of the Strike Team. This was set before the start of Season 1.