Visible crew/equipment: Donna overhears her father and mother discussing Laura's golden heart necklace and the picnic video. Then, just as Donna enters the bedroom, there's a white T-mark on the floor at the bottom of the screen.
Visible crew/equipment: When Audrey enters her father's office to find him in the middle of his Civil War recreation, a boom mic dips into the shot over their heads. (00:18:40)
Visible crew/equipment: When Sheriff Harry S. Truman first leaves the station, film crew are visible as they dolly back across the Ford Bronco. (00:05:55)
Visible crew/equipment: When James and Maddie meet by the lake, a clear blue trail of cigarette smoke flows in from the right, it's most probably someone's smoke from the crew.
Visible crew/equipment: At the very end, Sarah is alone while she's lying down, but when she has the sudden vision of Laura's necklace being dug up, the reflection of a crew member is visible in the round mirror. (01:32:50)
Visible crew/equipment: When Josie and Catherine are arguing at the mill, just as Pete says, "Oh Catherine, please," he moves toward the chair, and the reflection of a crew member wearing a cap is visible on the window, at the left side of the screen. (00:32:25)
Visible crew/equipment: While Truman and Cooper are at the bank, when they take the safety deposit box and walk over to the table, there's a green tape mark on the floor by Truman's feet. (01:03:20)
Episode Six - S1-E6
Visible crew/equipment: When the lawyer goes to leave, after discussing the life insurance policies with Catherine Martell, a boom pole is visible moving in the window reflection behind Catherine. (00:29:03)
Episode Six - S1-E6
Visible crew/equipment: When Hank steals the lighter at the diner, his and Shelly's previous tape marks are visible on the floor behind him. (00:17:40)
Episode Six - S1-E6
Visible crew/equipment: At the start of the episode, when Deputy Andy enters the police station, at least two crew members are reflected in the glass doors. (00:03:44)
Episode Four - S1-E4
Visible crew/equipment: When James approaches Madeleine at the diner, she turns to face him and, in the close-up, some equipment is reflected in her glasses. (00:31:32)
Episode Four - S1-E4
Visible crew/equipment: When James is on the phone to Donna, Madeleine walks into the diner and stands at the counter. As the camera pans from James to show this, a white tape marker is visible on the floor near Madeleine in the right-hand corner of the shot. (00:31:16)
Episode Four - S1-E4
Visible crew/equipment: After the court hearing scene, Cooper and company drive up to the veterinary clinic. Just before they arrive, we see a stationary shot of two petrol pumps. In the glass display on the pump on the left-hand side, a crew member is reflected. Cooper's vehicle then drives into view, and the same crew member is reflected again on the car door. (00:19:49)
Episode Two - S1-E2
Visible crew/equipment: When Deputy Hawk is interviewing the parents at the hospital, there is a square window behind them. The camera is reflected in it as it moves in towards them. (00:32:39)
Episode Two - S1-E2
Visible crew/equipment: When Audrey spots Cooper ordering breakfast, her yellow tape mark is visible in the doorway at her feet. (00:04:14)
Episode Two - S1-E2
Visible crew/equipment: Just before Norma bumps into Nadine inside the store, there is a shot that follows a model train running on a track. At one point, a crew member wearing a white shirt is reflected in a mirrored panel in the store's main window. (00:21:12)
Visible crew/equipment: At the diner, when Bobby asks Shelly if she needs a ride home, the reflection of a boom microphone is visible in the horizontal glass mirror behind Bobby (far left of the screen). (00:16:15)
Visible crew/equipment: When Bobby is released by the police, he speaks to his friend in the hallway of the station about the possible identity of Laura Palmer's killer. To avoid eavesdropping, Bobby tells his friend that they should speak outside. As they walk through the glass doors towards the exit, Bobby encounters his father and two other people. Tape markers are visible on the floor placed at their feet. (00:55:53)
Visible crew/equipment: When Sheriff Harry Truman takes the call from Pete Martell at the police station, a reflection of a seated crew member wearing headphones (it actually looks very much like David Lynch!) is visible in the glass divider of the office the Sheriff enters to answer the phone. Clear as day. (00:05:13)
Visible crew/equipment: A boom microphone is visible at the top of the screen during Leo Johnson's trial. (00:15:00)
Answer: The answer to pretty much any question beginning with "Has David Lynch ever explained _______?" is: no.