In order to give Julian something to occupy himself while he's talking, Mike Clattenburg had him mix himself a drink. They thought it looked really funny in his hand, and thought it might be funny if the character was always holding a drink. Thus, Julian is perpetually holding a rum and coke.
Phil Collins is shirtless in the crowd in front of Julian's trailer.
Elliot Page's character, Treena Lahey, was originally planned to appear in episode 1 of the first season. His scene was filmed, but was cut from the final episode. The deleted scene is available on The Trailer Park Boys' Youtube channel.
Lucy Decoutere, Sarah Dunsworth, George Green and Cory Bowles actually go by their real first names in the show.