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)
Other mistake: When Cooper is on the floor after being shot, as he's signing the check, he is doing so with the pen closed, and proceeds to click it open as he hands it back to the room service.
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 Five - S1-E5
Continuity mistake: When Leland Palmer suffers another mental breakdown during the party, Benjamin Horne tells Catherine Martell to dance with him, emphasising this by pointing his finger. The shot then cuts to Leland Palmer, and in the background, you can see Horne telling Martell again to dance with him. (00:39:57)
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)
Continuity mistake: During the barroom brawl, Bobby and Mike start fighting and Donna escapes out the back exit with one of the bikers. They leave on his motorcycle to meet James. Dale and Sheriff Harry are trailing them. Then a cut back to the barroom and Bobby and Mike are still fighting the bikers. However, if you look in the top right of the shot, you can see Donna and the biker still behind the bar, trying to leave. (01:19:13 - 01:19:50)
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)
Other mistake: When we are first introduced to Leland Palmer and Benjamin Horne, they are discussing a contract in front of a large, lit fireplace. A couch (on which Leland is seated) is in front of the fireplace. Strangely, the flames of the fire are visible through the couch, and also Horne's legs are at one point. (00:11:09)
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)
Continuity mistake: When Lucy is badly explaining to Sheriff Harry Truman which phone she transferred the call to, in the window reflection, you can see the Sheriff moving around the office to find the phone. But in the close-up cutaways of Harry, he is standing in one place. (00:05:07)
Continuity mistake: When Pete Martell finds Laura Palmer's body, there is a piece of wood on the ground near Laura's head as he approaches her. It disappears between shots. (00:04:20)
Continuity mistake: The credit has "Lucy Morgan " Later her name becomes "Moran", see the name plate on the desk.
Answer: The answer to pretty much any question beginning with "Has David Lynch ever explained _______?" is: no.