The title of the episode is the name for a classic TV episode format. In a traditional clip show, the writers use a throwaway plot to remind viewers of past episodes (this was helpful for catching people up since episodes weren't available on demand). Stargate SG-1 (1997), which starred Amanda Tapping (Naomi), had plenty of clip show episodes. Here, the Supernatural team defies the classic format by continuing the season arc, but clips are utilized.
Sam and Dean originally saved Sarah from a haunted painting in the season 1 episode 19 Provenance (2006).
Sam says that they need to find case # 1138, which is a nod to George Lucas's first film THX 1138 (1971). The numbers 1138 are also seen throughout the "Star Wars" universe.