Continuity mistake: When Ryan is lighting Marissa's cigarette with his, at the start of the shot it's full, then the shot goes to Ryan and it's still full. But then the shot goes to Marissa and if you look at Ryan's cigarette you can see it is almost all gone. Then the shot goes to Ryan and the cigarette is full again. (00:09:00)
Continuity mistake: When Marissa is dumped on the driveway by Summer and Holly, Ryan first sees her there her left arm is across her chest with her elbow sticking up. The next shot of Marissa her ams are straight and spread out, and the next they are close by her sides, which is impossible for her to have moved them herself as she is unconscious. (00:34:15)
Continuity mistake: When Kirsten and Ryan are talking while setting up for the Casino Night, the camera cuts between Ryan And Kirsten while they talk. Whenever you see both characters in one shot, her fringe is forward, but when you see the individual shot of her, her fringe is pulled back behind her ear. (00:18:10)
Continuity mistake: In this episode Seth, Ryan and Kirsten arrive at the country club in the Range Rover to get the boys ready for Cotillion. In the next scene we see Sandy with the surfboards in the back of the Range Rover as he has just come home and Jimmy arrives to apologise, soon after we go back to the country club where Seth and Ryan are trying on jackets and meet up with Marissa, Summer and Luke, proving that the Range Rover should still be there, not back home.
Continuity mistake: At the part where Kirsten brings Ryan and Seth to help set up the hall, Seth starts to blow up balloons with helium. In one shot he has an orange balloon under his arm and is tying the bottom, and the next he's starting to fill up a different balloon, without time to finish tying it and pick up a new one. (00:15:50)
Revealing mistake: The phone message that Ryan leaves on Luke's voicemail is different to what he originally said, which is "I want to make sure you took care of it. Take care of it," but the message recorded is, "I'm just calling to make sure you took care of it. Take care of it." Also the background sounds from the club - the music, people talking, etc, are missing.
Continuity mistake: When Marissa leaves the bar, after downing the pills and tequila, she leaves her bag, but presumably Ryan found it. Then, when Ryan sees Marissa down the alley he runs to her, but his hands are empty, yet, in the next shot, where he kneels over her body, Marissa's bag is in his hand and he puts it down beside her.
Continuity mistake: After Summer calls Seth and Ryan from the bathroom to say she's found Marissa, she puts her phone on the shelf, and then goes back into the main room to find Marissa gone. Then as Summer walks out the door she shoves her phone back into her bag, even though she left it on the shelf.