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Continuity mistake: The camera pans towards Arthur when is reading Penny's letter to Thomas Wayne; the items on the table (newspaper, pen) are in a different position compared to the rest of the scene. (00:48:35)

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Continuity mistake: In the last couple of cuts preceding Arthur's gun accident in front of the kids, the nurse's hands are not where they should be at the cut; her hands are on the kid' shoulders, then ears, before the cut she raises them to dance on the spot, but they are back on his shoulders in the next shot. The baby patient himself when Arthur drops the gun suddenly has his hands up under the chin. (00:28:25)

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Continuity mistake: Right at the beginning of the dance in the children ward, the kid with a blue hat on Arthur's right is sitting cross-legged with the hospital robe covering his calves and feet. At the first cut, his jammies and socks become visible. (00:28:05)

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Factual error: The cart behind Arthur during his dance for the kids has drawers of different colors. That is color coding reflecting the Broselow Tape, a tool used to measure pediatric patients and give estimates of the appropriate scaling for treatments. It's a system that started only in 1985, while the movie takes place in 1981. (00:28:05)

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Continuity mistake: In a close-up, Arthur grabs with both hands the gun he dropped and kicked across the hospital floor, but in the wider shot that follows he's using only the left hand, and it's also clear that Joaquin Phoenix's body is turned in a complete different way, with his feet adjoined instead of the open legs seen before. (00:28:35)

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Other mistake: In a city of millions and millions of inhabitants, when the protagonist chases his neighbour till she enters the building in William Street, the taxi that passes in front of him as he crosses the road is the same taxi with license plate T 9362 that nearly ran him over at the very beginning when he was trying to get his sign back. Which incidentally is a model of Chevy Caprice post-1981 (likely a 1987 Caprice). (00:02:25 - 00:24:35)

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Factual error: In the elevator, Arthur meets the single mom living on the same floor, Sophie Dumond. In Sophie's shopping bag, the one recognizable food item is a box of Betty Crocker's Hamburger Helper - Potato Stroganoff. Thing is, the packaging uses (look at the design of the 'menu idea') a design predating the introduction of the Helping Hand mascot, which happened in the late 70s. She just bought it, it can't be ancient, long expired food. (00:19:35)

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Continuity mistake: In the theater lavatory, Arthur puts the usher jacket in the sink. Part of the jacket drapes to the side of the sink, but at the cut the cloth is entirely contained in it. (01:05:00)

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Continuity mistake: Arthur inadvertently fires a gunshot in his living room. Right as he tumbles across the table, he knocks off the table the paper bag the gun came with, and knocks towards the edge of the table a pill bottle. In the closer angle shot when he cranks up the volume of the TV set, the bag is still on the table and the bottle is gone. The newspapers are also positioned differently. In the next shot we're back to the previous state (pills up, bag down, newspapers closer together). (00:23:10)

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Trivia: Murray Franklin's show is, as displayed on the TV in the hospital, on channel 3, the same channel The Jerry Langford Show was in King of Comedy. (00:59:25)

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Continuity mistake: In the first shot of the pediatric ward you can see on the left aisle a plush ladybug toy. When Arthur drops the gun, the toy suddenly between cuts is found in the arms of a patient, and then on the bed by him. (00:28:30)

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Factual error: Heading home after the first encounter with the social worker and the incident with the kid and the irritable mom, Arthur is trudging to get his meds at Helms' Pharmacy. Parked in front of the pharmacy there's a sedan, a Mercury Grand Marquis, which by bumper design is a post 1988 model, way past the events of the movie, in 1981. (00:09:20)

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Trivia: The detectives who are investigating Arthur throughout the movie are Detective Garrity and Detective Burke. In "The King of Comedy", inspiration for this movie, Rupert Pupkin was investigated by inspector Gerrity and Captain Burke.

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Continuity mistake: When Arthur Fleck gets hit by the yellow sign, the sign breaks in two different ways in the two separate shots - the first time it is evident that the bottom half of the sign splits further in the middle, while in the wider angle it stays largely intact. (00:02:50)

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