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.
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)
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.
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)
Visible crew/equipment: When Jackie and Babette talk with Cindy about their "good old times," a boom mic dips into the shot.
It's a Totally Happening Life - S3-E16
Visible crew/equipment: When Brenda and Dylan are in the same bedroom and the camera is panning about, you can see the end of the set in the upper left corner. (00:18:35)
Visible crew/equipment: Brandon and Dylan are in their hotel room and Brandon is talking to Kelly on the phone. Right after she says, "Are you sure you two aren't shackin' up with some biker babes?" it goes back to Brandon and you can see a boom mic above his head. It then continues until about when Dylan walks out of the bathroom.
Summer Storm - S2-E3
Visible crew/equipment: A mic drops into view when Brandon asks Kelly who she is looking at while she is staring at Kyle.
Everybody's Talkin' `Bout It - S2-E21
Visible crew/equipment: While the parent meeting is taking place at the Walsh's home, Donna's mother stands up to express her opinions. The camera pans out to a wide shot where a microphone becomes visible at the top of the screen. (00:12:00)
Everybody's Talkin' `Bout It - S2-E21
Visible crew/equipment: When Kelly and her mother are having dinner with David and his father at the Japanese restaurant, a boom mic is visible above their heads. (00:18:00)
Senior Poll - S3-E25
Visible crew/equipment: When Kelly returns home after her talk with Dylan, a boom mic is visible above her head. (00:37:45)
Necessity Is a Mother - S2-E10
Visible crew/equipment: Near the beginning of the episode, Brenda is sitting next to a tree talking to the group after Dylan gets up to leave, and a visible mic comes into view hanging center top of the screen.
Leading From the Heart - S2-E11
Visible crew/equipment: At the end of the episode when Brenda is backing out of the driveway, Jim and Cindy are watching her but you can also see someone standing on the porch in the background.
Visible crew/equipment: During the opening scene when the man is counting to 90 seconds there is a mic hanging in the top center the entire time.
Camping Trip - S2-E7
Visible crew/equipment: Dylan goes to the newlywed cabin and Brenda follows him. When she opens the door and says "can I join you" there a mic drop in the center of the top of the screen.
Down and Out of District in Beverly Hills - S2-E12
Visible crew/equipment: Kelly, Steve, Andrea, Brandon, and Dylan are all gathered near the lockers when Kelly begins to discuss her opinion of Steve's new girlfriend Christine. Just after Steve says "Tell me everything that's wrong with Christine", the camera pans to Kelly where a microphone becomes visible at the top of the screen. (00:15:15)
Christmas Comes This Time Each Year - S5-E15
Visible crew/equipment: When Christine Petit opens the door and says "Hello Dylan" and Dylan says "Christine" the other agent walks out of the room and as he is closing the door a microphone is seen above Christine's head. (00:18:00)
Lover's Leap - S6-E5
Visible crew/equipment: When Brandon is talking to Val in the kitchen, right after he says, "She had her moments," you can see a boom mic above Val's head.