Katee Sackhoff (Vic Moretti) tells a story about shooting the scene on the riverbank where she, Walt and the Ferg haul the dead bodies out of the water, and having a close encounter with the local wildlife. It seems that they weren't alone during the shoot.
Katee says they were joined near the water by "...this huge snake. And it looked like a rattler but it wasn't. It was some sort of, like, you know, supposedly harmless snake - that was five feet long."
It turns out guest star Diego Klattenhoff, who plays Forest Ranger Eli Cross, isn't such a huge fans of snakes. The sight of their surprise reptilian co-star inspired Diego to haul hiney back to his trailer in a rather non-Forest-Rangerly sort of way.
Happily, a brave sound man managed to remove the snake from the set and get the shoot back on track without anyone getting hurt. Including the snake.
Diego Klattenhoff may not be a fan of snakes, but he's had no problem taking on bad guys in other roles. He's battled aliens on Falling Skies, taken on a demonic virus on Supernatural, warred with America's enemies (and his feelings for his friend's wife) in Homeland, and will be fighting monsters in the future in Guillermo Del Toro's upcoming film, Pacific Rim. See? He's a brave dude!
You might have noticed another a familiar face in this episode. Bob Clendenin, who plays pizza delivery man Jamie DeBell, has been in numerous commercials and films, and made over 70 TV show appearances, including characters on Scrubs (a perverted oncologist), My Name is Earl (Slow Roger, a... slow guy) and more. Some of his favorite quirky character names are "Mr. Giggles, Plumber Dave, Louis the Stalker, Doofus, and most recently Bob the Demon."
The fisherman who caught the bodies may have been a beginner. The Parachute Adams fly used by the fisherman (and idetified by the Ferg) imitates the mayfly and is especially easy to see once it hits the water - a very helpful feature for the amateur fly fisherman.