When Rachel feeds Peter some dessert, he eats a few bites and remarks about how good it is. The camera pulls back and shows an intact cake.
When Peter and Rachel are sitting on the beach talking at the luau, her ex-boyfriend and the buffet waiter walk behind Peter and Rachel. When Rachel starts screaming at him, the two men are walking towards her.
When Peter meets Kemo on the beach and is given a beer, the bar towel is missing from Kemo's left shoulder in shots from behind Kemo, facing Peter. When the camera is facing Kemo and behind Peter, the towel is back. There are 4-5 alternating shots showing this mistake.
When Aldous Snow leaves the hotel, his female driver walks to the car twice.
When Peter and Rachel are talking on the cliff, the sky is sunny in Rachel's shots and overcast in Peter's. When Rachel talks, the sun shines on Peter's left shoulder. When Peter talks, the sky is overcast, with no direct sunlight.
In the several scenes, when Peter and Brian talk over iChat and the camera focuses on Peter's MacBook, the green light that should be on while the built-in camera is activated is off.
(at around 1h 30 mins) Peter and Sarah are talking and he says, "Stop pulling my face towards your face." She says, "Why?" and then briefly glances at the camera.
When Rachel is in the water telling Peter to jump off the cliff, her blue life belt is visible under and above the water as she bobs around.
When Peter is relocated to the room next to Sarah and Aldous, a hand and side of the camera are reflected in the right side patio door.
Peter mentions going to Laie Point, and Rachel tells him it is a "pain in the ass to get there." The cliff that Peter ends up hanging from is in someone's back yard at the end of Naupaka Street, 1/3 mile off of Kamehameha Hwy, 10 minutes from the resort.
In Sarah's room, when Peter consoles her.
In the flashback scene in the bar, when the bartender makes fun of Peter's hat.
When Peter and Brian are talking on the web cam, Brian starts doing a dance pretending he is in Hawaii, and Peter says "they're not Native Americans." Native Hawaiians are Native Americans, they can even receive benefits under the Native American Programs Act.