Other mistake: Technically, this movie should be called, "I Still Know What You Did The Summer Before Last Summer" since the events take place the summer after the end of the first movie. That would be two summers after the events of the beginning of the first movie. (00:01:05)
Other mistake: Titus emerges from the pool, scaring Karla and Ty, and he has weed which he immediately smokes despite it previously being underwater and unlit. (00:44:25)
Other mistake: In the scene of the housekeeper's murder, the position of bloodstains on her hand changes several times. It's also visible that she put in the cart immaculate sheets, which is kind of difficult to do when your hands are this smeared. (00:44:30)
Other mistake: Toward the end of the movie a helicopter with a US Coast Guard paint job shows up. The island is in the Bahamas, which has their own Coast Guard, it is highly unlikely the USCG would be the ones responding to the island. (01:31:45)
Other mistake: When Karla and Ty are in the jacuzzi, the "Bob Marley" guy shows up and says they can't be there because it's after midnight. At the same time, the fisherman is killing the hotel's maid who is knocking on doors to clean the rooms. Why in the world does the cleaning lady do the housekeeping after midnight?
Answer: Besides the name? Which is kinda brilliant in a Glass Onion/The Last of Sheila sort of way, being incredibly obvious in retrospect. No particular hint. There are, in retrospect, some hints disguised as jokes, like "What if I don't have happy memories of my childhood?" on the plane to the Bahamas, or throwaway lines like Julie's very first time talking to him when she mentions that she is feeling the serial killer breathing on her neck at that very moment, but no direct references to the lineage.
Sammo ★