Continuity mistake: When March pulls over in front of the billboard for "Pornocchio", his right hand is back on the top of the wheel in the reverse shot, it wasn't before the cut. (00:33:10)
Continuity mistake: When Healy holds the pinstripe suit in the changing room, his thumb is on the label in the wide angle, it's not in close-up. (00:39:10)
Continuity mistake: March realises he's sitting next to Robert Downey Jr. with a fake beard and quite dead. Notice his necklace, worn above the tanktop. In the rest of the scene the chain is above or below the shirt, randomly. (00:44:30)
Continuity mistake: Holland March shows smugly the ad for his agency on the fridge. The note is hanging from the clip differently in close-up than the other angles. (01:05:25)
Continuity mistake: When Russell Crowe and Ryan Gosling take most of the frame having the conversation in the car about the overflight curfew, the car is missing the rear mirror that it has before and after. (01:07:20)
Continuity mistake: When Russell Crowe says in front of the hotel "She's meeting somebody", the steering wheel is turned in a different way than you see later as he turns the wheel straight. (01:07:40)
Continuity mistake: When the Nice Guys are avoiding the police that is arriving at the crime scene at the hotel, in one shot they take a sharp turn, no rear mirror present, which comes back when they hit the brakes a moment after. (01:11:35)
Continuity mistake: Amelia falls off the car after shooting once. She is lying one way in the wider angle, but when the two protagonists approach her, she's lying a different way, on one side. (01:12:15)
Continuity mistake: The nice guys take Amelia to March's house and put her on the bed. She's lying on the bed, left arm stretched, green pillow shifted definitely towards the right. When she comes to, her arm is bent and the pillow is centered. (01:12:45)
Continuity mistake: When Haley asks "Why not go straight to the police", Amelia has just a bit of her hair in front of her left shoulder, a greater portion of it in the next shot. (01:14:55)
Continuity mistake: There's a brief cut to Ryan Gosling saying the line "Okay, so it's like Jack the Ripper and then your mom, basically." Amelie doesn't move, but her hair changes position completely. (01:16:05)
Continuity mistake: Jessica is on the phone and asks the person on the line "Richard something? Yeah." Holly in the background just puts her hand one one of the nearest cards, but at the cut she's moving her hand back from the top of one of her solitaire lines. (01:22:00)
Continuity mistake: John Boy draws the knife and makes his generous 'offer'. Cuts back to the Nice Guys who are driving fast; the Mercedes, as dirty as it is, is still perfectly intact with both sets of headlights working and the hood ornament. The front section was damaged when March fell asleep at the wheel earlier, and the car is again damaged when they pull over in the driveway. (01:24:10)
Continuity mistake: After the encounter with John Boy, March asks Perry a question. He says "They havent', and they are not going to." The sentence spans across two shots, with a visible gap in continuity in the way Russell Crowe puts his sunglasses on. (01:28:25)
Continuity mistake: Mrs. Glenn drops by to chat about the case; during the scene, her large square necklace is under or above her dress, randomly. (01:30:15)
Continuity mistake: When Mrs. Glenn shouts at March for cussing, she points at him with her left hand. Next shot and she's pointing with the right. (01:31:10)
Continuity mistake: When March says "Tally! Oh my God, you look incredible", he opens his arms, which are still firmly down his sides in the next shot. (01:34:55)
Continuity mistake: Holly throws coffee on Tally, but her face and dress are clean a moment later. (01:37:30)
Continuity mistake: When the older guy falls back and tries to drag Holly with him, she wiggles free leaning towards him, but in the reverse shot she's rotating the other way. (01:41:05)
Continuity mistake: John Boy throws his jacket in the street, but in the brief shot where Jackson tackles him he's still wearing it. (01:44:55)
