Continuity: Julie leaves the classroom and walks along, talking to Will, and she has two bags on one shoulder. In nearly every shot the bagstraps change position.

Continuity: In "I Know What You Did Last Summer", David Egan dates Susie Willis, who they said is Ben Willis' daughter. In the sequel, Ben Willis' wife's name is Susie, and his daughter is Sara Willis.

Audio problem: In this movie, when Ben gets ready to kill someone, he withdraws his hook, and we hear the sound of metal against metal. But he never scrapes or brushes metal, so this is an incorrect sound.

Factual error: When Brandy returns from outdoors soaking wet, she immediately reaches inside the door and pulls the "light switch", which is just a tangle of wires. Brandy would certainly have received an electric shock.

Audio problem: When Julie wakes up and turns the lamp on, and it goes off, Julie says “Shit” but her mouth says “ouch.”

Plot hole: When Julie sees Ben Willis at the club, he has two hands despite losing one in the first movie.

Continuity: Julie goes to the mirror and wipes away some of the condensation from it, still leaving some condensation on it. However when Julie walks away from the mirror, the whole mirror is suddenly clean.

Audio problem: After scaring Julie with his "suprise", Will decides to go and take a walk. When he says "I'm just gonna grab a few things," his mouth doesn't move.

Revealing: When Tyrell gets hooked in the neck, the blood coming from his neck is obviously CG. It disappears into thin air, and none of it stains his tee-shirt or skin.

Other: Titus emerges from the pool, scaring Karla and Ty, and he has weed which he immediately smokes despite it previously being underwater and unlit.

Continuity: The spots of blood on Titus’s chin differ and disappear after he gets stabbed in the hand.

Plot hole: I Know What You Did Last Summer was set in the summer of both 1997 and then 1998, making this film set in the summer of 1999. However written on Julie's grave is "Julie James 1979-1998" - it should be 1999.

Continuity: When Julie is in the confessional, a tear slowly trickles down the center of her left cheek. We then cut to a side shot and the tear has moved next to her nose.

Continuity: When the four are walking to the hotel, as they walk under the outdoor archway, Tyrell’s glasses move from up on his head, to on his nose, to back up on his head between shots.

Other: 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.

Continuity: Before Julie gets her knife and cuts Will with it, the camera zooms out and you can see her go for the knife and not get it, so they make you think she actually is supposed to go for it the second time.

Continuity: When Ben falls in the grave his eyes are closed, then the camera cuts and the first or second time it cuts and you can see his eyes sort of open.