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Factual error: It is established that Penny Fleck adopted Arthur and that he's been abused. In her file, when Arthur reads it, you can see that she was admitted the first time to the psychiatric hospital at 15 years of age, had multiple episodes with drug abuse, and the file mentions she is 25 and single on the date of the report, 11-2-1952. A single parent already had rather slim chances to adopt in the 50s, but a known mental patient and drug abuser, not a chance. (01:13:40)

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Continuity mistake: In the shot when he turns the last 2 corners in the corridor before getting to the stairs, the file in Arthur's hands is facing the opposite way compared to before and after - the label should be on the inside, not the outside. (01:13:20)

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Continuity mistake: Thomas Wayne and Arthur Fleck are talking in the bathroom. Joaquin Phoenix's hair changes position on his forehead several times even when he does not touch it and/or shakes his head. (01:06:15)

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Trivia: The person contacting Arthur Fleck on the phone introduces herself as Shirley Wood. Shirley Wood was the name of a talent coordinator for Late Night with Johnny Carson, active in the year depicted in the movie.

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Continuity mistake: During the scene when Arthur is making funny faces at the kid, the hair wisps on Joaquin Phoenix's forehead change position between shots. The mother also turns slightly towards him in almost every cut, but his antics are in continuity. She keeps 'just noticing' him and turning towards him without the opposite movement to balance. (00:07:45)

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Continuity mistake: Arthur is taking notes during the standup comedian's performance. There are a cigarette lighter and a packet next to him on the table; in the close-up that follows, they have changed position. (00:25:45)

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Continuity mistake: In the close-up of the gun at the beginning of the scene when Arthur is watching "Slap that bass" from "Shall we dance", notice in background the bullets; there is one angled parallel to the gun and 3 more at a slightly different inclination, plus one at right angle with the first (plus other 2 not quite aligned with the rest). A couple seconds later he aims the gun at Fred Astaire, and that group of bullets changed angle entirely. (00:22:10)

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Continuity mistake: After the gig at the comedy club, Arthur and the neighbour Sophie pass in front of a newsstand. The copy of the Examiner saying "Killer Clown On The Loose" is kept in place by a clothing pin placed diagonally, top right-to-bottom left. In the close-up when Arthur looks at it, the pin is top left-to-bottom right. (00:45:25)

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Continuity mistake: Arthur gets on stage at the improv club and has one of his laughing fits. When the camera is behind him, facing the blinding stage lights, you can see that he is choking himself with the right arm and holding the book with the left. But it was the exact opposite in the previous shot. (00:43:44)

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Plot hole: Arthur's appearance on the talk show makes hardly any sense. The show is a close port of Johnny Carson's Tonight show, for a huge audience, and yet he receives no screening at all, they put him (someone NOBODY in the staff knows the first thing about) on the air literally without a clue of what he is gonna do or say, and wearing a highly controversial costume. And, when he murders Murray, it is implied that everyone was able to see him doing that right away and he is cut 'off the air' at some point, as if the show were really live, which is preposterous for this sort of program outside of specific events (similar to how in contemporary TV "Jimmy Kimmel Live!", is not live). Even earlier when Arthur opened the letter his mom addressed to Wayne, you could hear the end credits of "Live with Murray Franklin" with the announcer saying the show is "Taped live in front of a studio audience." (00:48:00)

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Continuity mistake: The last of the Wall Street Three is shot as he tries to flee; he falls down in two very different takes. In the side view he choreographically falls with the jacket rolling up his back, and with the left leg (initially) forward, foot on the ground. In the previous view, camera behind Joaquin Phoenix, he fell with the sole of that foot kicked back, and with the jacket still down his back. (00:32:25)

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Continuity mistake: Arthur finishes the last yuppie off, and he lies stone cold dead on the stairs. However, he is not lying in the same position the two times it is seen. The second time he has his left hand one step lower than the right (which was the only one visible earlier) and his knees are on the platform (in the first shot, only the tip of the shoes touch the floor). (00:33:45)

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Continuity mistake: When one of the Wall Street Three charges the punch to hit the not-yet-Joker, his buddy in the background holds Arthur's bag with the hand on top, to the point that right before the cut his thumb sinks in the bag making it bend. When the punch lands, he's holding the bag by the side. (00:32:15)

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Continuity mistake: Arthur tries to get up from his seat, but one of the yuppie bullies restrains him. Then the lights flicker for a moment, but it's an editing trick, as something else changed in the car; the chips' paper bag that was sitting on one of the seats in the row facing Arthur's, is suddenly gone. It comes back right after, when Arthur is struck down by the punch, and it keeps coming and going. For instance; Joker shoots the second guy dead? Bag's on the seat. Third guy runs away? Bag gone. (00:32:05)

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Continuity mistake: One of the Wall Street Three begins approaching Arthur, and doing so he grabs the vertical support and spins around it. There's a cut mid-spin and his buddy in the background is standing in different positions; first he is laughing leaning against the support closer to him, then he is in the middle of the subway car holding two poles. (00:31:20)

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Factual error: When Joaquin Phoenix and Zazie Beetz are taking a walk after Arthur's performance, between the arcade and the newsstand there's a modern video intercom with keypad, not quite fitting the 1981 setting, since the first model of its kind was introduced in 1984 (kinda odd to leave something like this in when they went through the trouble of placing appropriate arcade posters really close by). (00:45:25)

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Stupidity: After one of the policemen decides to jump over the railing and right into the angry mob (!), Arthur just easily sneaks by ducking under it and takes a nice stroll that will lead him through an unlocked door. Nobody in the mob he is part of decides to do the same, and you can also see that one of the policemen is turned towards him, but does not even yell at him or move. And of course, with the theater packed with the Gotham elite basically under siege by a mob and guarded by the police, the door is unlocked and unchecked. Why not. (01:02:55)

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Factual error: Following Zazie Beetz, Arthur arrives in front of the bank. The crossing is using red colored tactile paving. While technically already invented, truncated domes paving was not adopted in the US in the early 80s, but began appearing in the early 1990s at public transportation stations, and it was not until 2001 that they were used in curb cuts. (00:24:35)

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Continuity mistake: The first time we see Randall, he hangs his clown suit next to his locker; his right hand drops, but in the next shot it starts still up. (00:15:50)

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Continuity mistake: Talking with his social worker Debra Kane, Arthur is moving his legs nervously as she asks him about the journal. In that shot his cigarette is almost smoked to the filter, but in the next one there's still an inch to go. (00:05:35)

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