Dawson Casting: Weirdly inverted - Katie Cassidy (Trish) is four years younger than her character and Amber Borycki (Beth) is three years younger than hers. Played straight with several of the others though.
Played doubly straight with Madison, which is one of the reasons her character is so Narmy. She was a twelve-year-old playing a nine-year-old, which wouldn't be so bad if her character acted nine years old. She comes off more like a twelve-year-old playing a nine-year-old playing a four-year-old.
Enforced Method Acting: Even though they knew it was coming, and they did multiple takes of it, when the seagull falls on the bridesmaids table during the first episode, their screams of fear were genuine. No matter how many times you drop a bird on their faces, they never get used to it.
Bobby/Ellsworth is Abby's dad, the sheriff on the island. Also Ruby is Trish Wellington, the bride to be.
After recognising Callum Keith Rennie in the photos of Wakefield, anyone with even a passing familiarity of the kind of characters he specializes in will be sure of the serial killer's return right from the start.
The actress who plays Abbey is good friends with Cold Play. She even appears in the end of their music video for the scientist.
Word of God: The night a new episode airs, the actor who got killed off would take part in an online interview with fans, in a Q and A session about the show. Seeing as how none of the actors knew what happens in the show after their characters dies, and they weren't allowed to give away any spoilers, it was mostly just for clearing up misconceptions that were already supposed to be obvious.