Continuity mistake: At One Eyed Jack's, when Agent Cooper and Jacques are sitting and talking there are 2 glasses of beer on the table. In one shot Jacques finishes a glass. When he gets up, both glasses are full. (00:10:20 - 00:11:40)
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.
Continuity mistake: When Cooper is at the police station describing the events of the night of the murder, he is seen taking a doughnut and placing it on the napkin next to him. A few shots later his napkin is empty and the doughnut is back on the stack.
Continuity mistake: The position of Blackie's fingers on Audrey's chin switches depending on the angle. From behind, her fingers are straight; from the front, her fingers are scrunched up/bent.
Episode Nine - S2-E2
Continuity mistake: The necklace James took from the coconut in Dr. Jacobi's office in the previous episode had a gold chain. When he gives it to Agent Cooper in this episode, it's on leather.
Visible crew/equipment: A boom microphone is visible at the top of the screen during Leo Johnson's trial. (00:15:00)
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.
Continuity mistake: When the three drinks are placed on the bar in front of Cooper, the sheriff, and the judge, the amount of foam on top of each drink changes drastically between angles.
Continuity mistake: Ben Horne's glasses are knocked off during his arrest at the Great Northern. No one picks them up, but when he is brought around the corner of his desk, he's wearing them again. (00:28:50 - 00:30:30)
Continuity mistake: The plate, bread and milk that Pete drops on the floor change position between shots.
Continuity mistake: At the Roadhouse, Donna has her hand on the only glass of drink on the table, but whenever the shot cuts to James, the drink is next to him with nobody holding it.
Continuity mistake: After Nadine smashes the milkshake glass, the cream and blood which has splashed on her face changes between shots.
Continuity mistake: In the hotel lobby, the chair that Leland knocks over switches between shots between lying on its side and on its back.
Continuity mistake: After Leland is pulled over by the police, he goes to open the boot of his car, and he is wearing dark gloves. When he rummages in his golf bag containing the body for a golf club, he is wearing no gloves. Then he holds the club in the air to show Cooper and the gloves are back again.
Plot hole: More than 24 hours after Ben is arrested his daughter Audrey comes and asks Cooper if her father was arrested. How has she not noticed that he is absent and in jail?
Continuity mistake: The amount and pattern of the golf balls on the Palmers' living room floor changes between shots.
Revealing mistake: When Leland Palmer is locked in the cell he starts screaming and runs headlong into one wall, then the other. The first wall wobbles noticeably on impact, indicating it is being shot on a set.
Character mistake: At the Roadhouse Cooper states that the second victim (Maddy) was found dead two days ago. It has been less than 24 hours since the body was found: he likely means she was murdered two days ago.
Plot hole: In the bait and switch section, why does anyone involved agree to Leland being Ben's attorney when both victims are relatives of Leland? Neither Ben nor any of the police are in on Cooper's plan, and it seems implausible at best that they would agree to this.
Plot hole: Harry states that Ben was not arrested until after midnight. However in episode 2.7, the arrest takes place earlier in the evening, shown in establishing shots and the other events which occur afterwards.
Chosen answer: Laura was killed by her father Leland, whilst he was apparently possessed by the spirit BOB. The exact manner of her murder is not clear, as several injuries found during her autopsy we later discover occurred during a separate incident before her murder. We know that she was beaten and killed in an abandoned train car, and her body was then wrapped in plastic and thrown in the river.
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