Continuity mistake: When Waldman is telling his wife Alice how disgusting her dog is, the way he holds his spoon keeps changing between cuts.
Continuity mistake: At the end, when Sam places the last few mini figurines on the hex riser display, note the house's chimney stack faces to the right, but when Sam picks up the display the chimney faces to the left. There are some other difference between these shots, such as the miniature tree under Dash's car goes from full green foliage to sparse, then back to full. (01:45:40)
Continuity mistake: During the first meeting between Lou and Madeline Kahn, her fur stole changes position between shots almost more often than she changes names. (00:09:30 - 00:10:30)
Continuity mistake: After Redmond is killed, when the flashback starts, Leonard's back is to the main door of the cabin. When the flashback is over, his back is to the kitchen.
Revealing mistake: Just after the scene where Mark is killed, there's a shot of Jason's feet as he opens a screen door and walks across a dusty hardwood floor. As the dolly pulls backward across the floor, you can see the camera's roller marks in the dust. (00:59:10)
Continuity mistake: During Buffalo Bob's first appearance, he's holding a rake with both hands. In the next shot, he's holding it with just one hand.
Continuity mistake: Joe is looking through his yearbook while Marie chats with the old headmistress. He finds the page with Adrian's photo. At first, the name under the photo is Adrian Pryce. In the closeup shot, it now reads Adrian Doyle Pryce. (01:12:20)
Continuity mistake: Anna brings Semyon only copies of the original diary. The sheets are held together by handbag clips, which are closed in the close-ups, and open in the views from her angle. (00:23:00)
Continuity mistake: When Renée Zellweger drives up in front of her house the first time in the movie, as she shuts her car off, her window is down. When she gets out, the window is back up.
Visible crew/equipment: When Helen is handcuffed by the cops after being accused of having killed her friend Bernadette in her house and runs through the living room, the camera shadow is visible on her chest and on the wall behind her. (01:01:25)
Continuity mistake: When Willy asks the decorator on the phone what's the difference between Italian and English, his Samsung Blade switches hands, switching back when he holds it against his chest. (00:33:05)
Continuity mistake: In the classroom when Peter is being possessed, he slams his face down into his desk twice, splattering blood onto it. After he falls back screaming, the camera changes angles and now his desk is clear of blood. (01:38:25)
Continuity mistake: Velma reluctantly agrees to Daphne's idea to check out of the mysterious locker. She says "We'll come up with something." Right part of the frame, and in the background there's an extra (black kid with a plaid white shirt) that is simultaneously also eating at the table in the reverse shot. (00:31:15)
Factual error: The solar panels (or mirrors) are facing away from the sun. The sun's position can be estimated from ground shadows and object highlights and the panels are facing in completely the wrong direction. (01:11:40)
Continuity mistake: At the party, when talking about the trip to Sweden, just after Mark says Pelle's invited them to an authentic hippie midsummer at his yodelling farm, it cuts to Dani asking "Oh, yeah." To the right of shot, Mark is shown holding a bottle with part of the label slightly uncovered, while the rest is covered by his hand. Two shots after, in a shot of the whole group, Mark's hand is now entirely covering the label. (00:14:20)
Visible crew/equipment: Spade returns to Brigid O'Shaughnessy's apartment and tells her about his meeting with Joel Cairo. Right when he says, "He offered me $5,000 for the black bird," the shadow of the boom mike can be seen above the fireplace. (00:31:55)
Other mistake: After the third homicide, everyone gathers around the statuettes of the ten little Indians. Small problem, though. There are eleven little Indians. (00:42:20)