Beverly Hills, 90210 (1990) - 5 major mistakes

Continuity: 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.

Visible crew/equipment: When Brenda is talking with Michael Miller, you can see a microphone come into the top of the frame.

Continuity: 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.

Continuity: 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 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.