Other mistake: When the show aired in 1990, in the pilot episode Brenda falls for Jason. She later on reveals herself to be a "16 year old junior" in high school. Season 2 opens up with the gang on summer break which technically would make them going into their senior year. It wasn't until Season 3 that they were going into their senior year. They graduated in 1993 from West Beverly but the show debuted in 1990 so technically they should have been sophomores.
Continuity mistake: When Dylan pulls up to the After Dark, a group of guys come over and ogle his car, but when Dylan enters the club, one of the guys outside is already at the bar. (00:11:15 - 00:11:50)
Stand (Up) and Deliver - S1-E17
Visible crew/equipment: When Brenda is talking with Michael Miller, you can see a microphone come into the top of the frame.
Continuity mistake: In this episode, Steve breaks into the school to improve his school grades in order to get into USC, because that is where his Dad went. But when the gang does go to college at CU, Steve's father is an alumni of that college not USC.
Angels We Have Heard on High - S6-E15
Other mistake: In the scene at the Peach Pit where Rush tells Steve that he is his biological father, he shows Steve a copy of the birth certificate. Under adoptive parents, it lists Sanders, Rush and Sanders, Iris. Only Iris isn't Steve's adoptive mother, Samantha is. Iris is Dylan's mother who lives in Hawaii.
Perfect Mom - S1-E7
Continuity mistake: In this episode we are (at the fashion show) introduced to Donna's mother for The First Time. She is called on stage as Nancy Martin. In all further episodes she is known as Felice Martin.
Continuity mistake: In this episode, a main story line revolves around Steve and Kelly's supposed first and only sexual encounter, at the beach club while they were in high school. Sorry, but the early episodes made it clear that they slept together many times while dating, and The First Time was in Steve's room while his mother was being interviewed downstairs.
Twenty Years Ago Today - S4-E8
Continuity mistake: In the scene where Brandon is going back to Dylan's house to retrieve his parents' wedding anniversary gift, when he is in the car and when he jumps out hurrying to the house he has his sunglasses on, but in the next shot with a different camera angle, as Brandon continues to hurry to the house, he has no sunglasses on. (00:22:00)
Visible crew/equipment: When Clare enters the beach house to find Kelly with Joey, a boom mic briefly dips into the shot. (00:08:30)
Continuity mistake: This is the first episode in which Kelly celebrates a birthday, and it is in March. A few seasons later, Kelly has another birthday, but this is celebrated in one of the first episodes of the season and takes place when everyone has just returned from their summer excursions. This would put her birthday in September.
Visible crew/equipment: When the scene changes to Brandon, Brenda and Dylan going to the movies, look closely. You will notice Brenda waiting for Dylan in front of the movie theater. Then later, they show the exact same scene when she is waiting for Dylan to show up on their movie date. It's very quick, but the editors apparently didn't catch it.
Continuity mistake: When they are watching Colin's car chase at television, Colin is wearing an orange shirt. But Colin was wearing a grey shirt before the car chase started, and he is also wearing a grey shirt when he is caught.
Other mistake: In this episode, Felice and Dr. Martin are supposedly celebrating their 25th wedding anniversary. In the sixth season episode "Earthquake Weather, " Felice told Donna that she had to drop out of the Rose Court competition after getting pregnant. She got married at that time, and suffered a miscarriage. In the earlier episode "Offensive Interference, " Donna saw her mother in a photo of the 1969 Rose Court contestants. Therefore, Felice and John should be celebrating their 29th anniversary, not 25th.
Continuity mistake: During the scene where David, Donna, and Andrea are in the casino and Andrea puts one dollar in a slot machine and hits the $500 jackpot, she screams and David tells Donna to get some buckets so that they may put all the coins in them. At that exact moment, they are interrupted by a security guard who asks them for their id's and when he figures out they aren't 21, he asks them to hand over the buckets of coins. At this moment, David and Donna hand over at least one bucket of coins. However, between the time David told Donna to get the buckets and when the security guard questioned them, the gang did not (and had no time to) get to fill up any of the buckets full of coins.
The Child Is Father to the Man - S3-E22
Visible crew/equipment: When Dylan calls Kelly at the end of the episode, in the shots of Dylan, a boom mic is visible above his head.
Visible crew/equipment: In the hotel room with Brenda and Dylan, right before he picks her up and puts her over his shoulder there's a mic drop in the top right corner.
Leading From the Heart - S2-E11
Visible crew/equipment: When Kelly goes to the Walsh's house to speak with Bobby in the morning, a microphone becomes visible at the top of the screen while the two are sitting at the kitchen table. (00:42:00)
Continuity mistake: Taz (lead singer of group Donna and David are producing a music video for) recognizes Kelly from her 'Seventeen' magazine cover and mentions it was in spring (May) 1994; however that was still the gang's freshman year in college (Season 4) and Kelly did not do the Seventeen shoot until season 5, and the magazine cover was out in the spring of 1995.
Crunch Time - S4-E16
Continuity mistake: At the end of the episode, Steve and John Sears are behind the table and one of them is about to be voted out of the fraternity. Pay attention to the scene where fraternity president Mike Ryan is giving instructions to the other fraternity brothers on how to vote and behave during this process. At the exact scene where Mike Ryan says, 'Your absolute silence is required', in the background we see Steve and John Sears staring down each other in anger. A split second later just as Mike Ryan finishes that sentence, the camera shot now just shows Steve sitting straight forward, looking down at his lap slightly in a kind of sad, defeated state.
