The trivia items below may give away important plot points.
Billy Mahoney's death is an in-joke to filmmakers, where the three acts of a story are frequently described as: 1) You put a character in a tree. 2) You throw rocks at him. 3) He somehow gets down from the tree.
When David Labraccio (Kevin Bacon) goes to visit Winnie Hicks (Kimberly Scott) to "atone" for taunting her, he mentions that they both went to "S.B. Butler" school as kids to remind her who he was. Writer Peter Filardi included this as a nod to his hometown in southeastern Connecticut, where there is a real "S.B. Butler" elementary school, near downtown Mystic, CT.