Boom mic visible: When Tony talks with Stephanie in her apartment after the "lonesome subway ride" scene.
Revealing mistakes: During the opening scene of the movie (between roughly 2:40-2:47 seconds into the movie), Tony enters the tailor's shop by pushing open the door. The handles have "Pull" stamped into them.
Continuity: While Tony and Stephanie are sitting at the windows in Stephanie's apartment, she reaches out and grasps Tony's left hand with her left hand; but when the camera jumps back, she's holding his left hand with her right hand.
Continuity: Upon entering the discotheque in the beginning of the movie, Tony greets the same man (in blue shirt) twice.
Crew or equipment visible: Reflected in the mirror in the studio as Tony and Stephanie are practice their "More Than a Woman" routine.
Revealing mistakes: When Tony and Stephanie go to dance to Tavare's version of "More Than a Woman", Tony places the needle on the record, and the arm skips all the way to the end, revealing that the record player is broken and the music dubbed in later.
Continuity: The night they take the priest to the club, Tony starts dancing solo and the dance floor clears. His dance partner is standing up by the stage dancing in place, as are the rest of the dancers as they watch him dance. The lady briefly disappears and reappears between shots.
Continuity: In the opening sequence, Tony walks down the street and it's visibly sunny and the pavement is dry. Then when he runs across the street toward the paint store, the street and sidewalk are wet from rain.
Continuity: Just before Tony gets off the subway train the first time, "45th Street" station signs are visible from inside the car. After he's gotten off the train, he is waiting for a train at "53rd Street". Neither station is a transfer point in the NY subway.
Continuity: When Tony first enters 2001 Odyssey, the doorman (gray vest, glasses) stamps his hand and Tony greets him. In the next shot, when Tony moves into the main hall, the doorman is already standing there and Tony shakes his hand.
Continuity: Just before the guys crash into the Barracudas' hangout with Bobby C's car, the car windows are down. After they crash, they open the doors, and the windows are up. When they get back in the car, the windows are down again.
Errors made by characters (possibly deliberate errors by the filmmakers): The story that Tony tells Stephanie that a worker was buried in the Verrazano Bridge is false.
Continuity: When Tony asks his boss for an advance on his pay as they are closing the paint store, it is dark outside. In the next shot, when he is running down the street to his house after work, it's still early afternoon.
Continuity: When the (former) Father Frank Jr is leaving the Monero household to go to a settlement home in the first shot, the car he is about to enter is a Ford Country Squire (full size) station wagon. In the next shot when he gets in the car and it pulls away, it is a different car: a Ford LTD II (mid size) station wagon.
Continuity: During the Night Fever line dance, Joey is to the right of Tony, but in the previous shot, he had just gone outside to hook up with a girl in the car.
Errors in geography: Near the end of the film, during the "How Deep Is Your Love" music sequence, there is a time-lapse sunrise over the Brooklyn skyline. The shot is taken from New Jersey or Liberty Island. Some mistakenly believe it to be a time-lapse sunset (in reverse) or a sunrise over the Manhattan skyline.
Continuity: At the dinner table after father Frank has left the priesthood, Tony is eating and his fork changes from left to right and back several times before he screams at his mother.
Continuity: When Tony wakes up after the first night at the disco, he sits up. He has nothing in his hands after scratching himself. After a moment he stands and the scene cuts to a shot of the mirror. In the mirror you can see smoke and briefly a cigarette in his hand that had not been there. He then puts the lit cigarette in an ash tray on his dresser.
Boom mic visible: In the scene when Frank Jr. leaves the family home, as Tony and Frank Jr. approach the car door, the shadow of the boom mic is visible on the tree trunk.
Continuity: In the opening scene where Tony is walking on the side walk carrying a gallon can of paint, he walks by the same Ford Econline van twice.
Continuity: When Tony is walking down Brooklyn's 86th Street with the paint can, he walks toward the Benson theater marquee. After he hassles the young lady, he walks away from the Benson, back the way he was coming from.
Miscellaneous: When Tony is walking with Bobby C. by the paint store, a crowd is reflected on the last window they pass before they reach the corner.
Boom mic visible: During the scene where Father Frank Jr. is leaving the Manero house, when Tony, Father Frank Jr. and the driver load the bags into the car, a boom mic shadow is visible on the top portion of the car.
Continuity: After their initial dancing practice as Tony and Stephanie are walking down the sidewalk, Stephanie's purse moves from her right shoulder to her left shoulder then right again.
Continuity: After Tony leaves the "Disco Duck" dance lesson, he introduces himself to Stephanie. He asks her if she is practicing to be a bitch. She turns her head to him, then the camera angle changes. She is facing away and turns around to face him.
Audio/visual unsynchronized: When Bobby asks Frank (the former priest) about getting a papal dispensation for an abortion, the camera angle changes so that the side of Bobby's face is shown and all of Frank's can be seen. Frank answers Bobby and then Bobby says "Well maybe you can, maybe you could do it for me." At this point, Bobby's mouth is clearly not moving except once, which indicates that his retort was dubbed in over a one word retort.
Continuity: At the final bridge scene when Bobby C is climbing up the cables of the bridge, he has on white sneakers. Moments later when he's talking to Tony on bridge's beam he does a headstand and he has on black shoes.