Always Waiting for the Next Bad News - S3-E9
Continuity mistake: Jessica is wearing a massive earring, but when the camera is behind her, she isn't. (00:23:38)
Other mistake: In the hall during the Spring Fling Dance, Bryce reminds Justin of the night before Freshman Year when they stayed up all night talking about being kings of the school. This doesn't make sense considering Justin is then a Junior while Bryce is a Senior. Bryce does however end up in the same year as Justin when he transfer to Hillcrest for Spring Semester and goes in as a Junior. (00:52:48)
Continuity mistake: When we see Hannah in the room (when Bryce and Justin are talking about beer pong and stuff before Bryce walks in), the door stays shut the whole time. But when the camera shows Bryce's side, the door opens slightly, but Justin closes it.
Graduation - S4-E10
Continuity mistake: In the scene before the last when Clay is getting out from his house with 2 bags and goes to put them in Tony's car, he has a bag on his back but when he closes the trunk the bag disappears. (00:33:00 - 00:34:00)
Continuity mistake: During the first tape Hannah says that there are 13 tapes as there are 13 sides to every story, however we later find out that she only planned and recorded 12 tapes that night, and the 13th (Mr Porter's) was unplanned and recorded later on, so she would not have included it with the others when she mentioned how many tapes she was going to make in the beginning.