Continuity: In season two, episode "The Return of the Nana", Marissa's arms change position repeatedly while she and Trey are down at the beach. Also, her bag appears with her, even though she left the apartment without it.

Continuity: At the beginning of the first episode of Season 3, "The Aftermath", Ryan's hair is much shorter than it was at the last episode of season 2. Since they arrive at the hospital with a bleeding Trey, we know that this is right after Trey got shot. It doesnt make any sense that Ryan would go get a haircut right after Trey got shot and then go to the hospital with him.

Continuity: Season 4 - Episode 8 - The Earth Girls Are Easy - When Kaitlin is at the party, talking to Bullit, her strand of hair changes from hanging over her eye to hanging down next to it, without her moving her hands or head to displace it.

Deliberate "mistake": Lindsay is not at Caleb's funeral in the last episode of season 2, "The Dearly Beloved". It's unlikely that she would have missed it - she is still on good terms with him and he is her father, the only reason she left was to be with her mother, not because she didn't love Caleb.Obviously they didn't want to create another drama with having Lindsay there while they had to focus on the important story-lines - Caleb's death, Kirsten's drinking and Marissa shooting Trey.

Continuity: At the beginning of the second episode of season 3, "The Shape of Things to Come," Summer, Marissa, Ryan and Seth are ordering pancakes at the restaurant. In this whole scene, Marissa's blue mug keeps changing position between shots.

Continuity: Season 4 Episode 5 The Sleeping Beauty: When Taylor calls Ryan in the middle of the night (around 03:03 when he first checks), the second time Ryan checks the time on his radio it shows 03:23, however it jumps back to 03:04 when he looks again.

Other: During the final montage of episode 4-16: "The End's Not Near, It's Here," the banners at Berkeley were welcoming the class of 2012. But this was fall of 2007, so four-year students would finish school in 2011. Submitted by DavidK93

Continuity: In season 2 episode "The Risky Business", the top Summer holds changes position in her hands.

Continuity: When Sandy first picks up Ryan, we see in several shots that Ryan's bike is in the trunk, and that the trunk is open. However, when they drive up to the house, the trunk is now closed, with no bike.

Continuity: 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.

Continuity: 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.

Continuity: When Ryan and Sandy leave to take Ryan back home, it is supposedly the morning. But as they leave, the sun can be seen over Marissa's shoulder, which is the west (because her back is to the ocean). Since the sun sets in the west, it can't be morning.

Other: After Kirsten is talking to Sandy about the fact Seth got into a fight and she comes inside to see that Ryan has made breakfast, there is no way he could of set the table, found all the utensils and ingredients and cooked them by the time Kirsten gets back inside.

Audio problem: At the beginning of the episode we see Kirsten on the phone, in the next shot we see Sandy pick up a towel and look out the window. At this moment you can see Kirsten, and she is still talking on the phone, but her mouth doesn't even move.

Continuity: 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.

Continuity: 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.

Continuity: In the morning when Seth goes into the kitchen where his parents are, he reaches into the cupboard to get a bowl. However, in the next shot he now has a box of cereal.

Continuity: When Ryan's lunch tray gets knocked out of his hands in jail and the guy pushes him onto the table, a fork appears in his hands with no time to pick it up.

Continuity: 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: In the scene where Ryan and Anna are learning to waltz Anna's hand goes from the top of Ryan's shoulder to the side of his shoulder and back to the top of his shoulder between shots.