Continuity mistake: When Tracy is running away from the police, there is a shot of her pushing through the crowd until she is free, but the next bird's-eye shot shows her pushing through the marchers all over again.
Factual error: The movie is set in 1962, but when Tracy misses her bus, she catches a ride on an International-Harvester truck that wasn't introduced until 1969.
Continuity mistake: In the scene where Tracy first goes to detention and meets Seaweed, when Seaweed says, "Well this is something for you," and then he introduces himself, look on the floor behind him. You can see crinkled up paper balls on the floor that throughout the entire scene move spots, and you never see anybody pick all of them up. For example, watch when Seaweed is dancing and his foot touchs a ball and it gets tossed aside and magically disappears.
Continuity mistake: In "Welcome to the 60s" where they enter Mr. Pinky's Hefty Hideaway and Edna is given the contract, she switches her purse to her other hand. Then the camera angle switches from Edna to Mr. Pinky and then back again. The second time, she switches her purse again.
Continuity mistake: When Inez is singing in "Run and tell that", Link's arms are going from being crossed to hanging down between the shots.
Factual error: During "good morning Baltimore" number, streetcars are seen passing behind several times. However, they wear the red and cream livery of Toronto (where it was filmed), when they should be yellow.
Continuity mistake: At the end of 'Run and Tell That' you see Penny begin to get off the bus first. Next shot, you see Tracy stand up to get out with Penny behind her. In the next shot, Penny is off the bus first again with Tracy behind her.
Continuity mistake: When Seaweed sings "Run and Tell That", he is singing to Penny, "And then there's those who try to help God knows." When the camera is facing her, Penny is shown looking very stiff, as if she wasn't dancing (or couldn't get into the groove). When the camera is over her shoulder, showing Seaweed, she is dancing. The next shot of Penny she is not dancing again.
Continuity mistake: When Tracy stops to sing at the music store, the lights are on and people are inside. In the next shot, when Tracy runs across the street, the store is dark.
Continuity mistake: At the end of "You Can't Stop the Beat," the first angle is of Tracy and Link, and then Penny and Seaweed come down a space that the Dancers make them. At one point the Dancers are almost up and then in the next shot, the Dancers are bent down and are coming up again.
Continuity mistake: At the beginning when Tracy hasn't even been shown yet, you see some people pulling open a window gate, and the window has a new sign and a couple sale signs on it. Later in the film, when Tracy is singing 'Good Morning Baltimore', she passes by the same place. Only this time the window gate is closed again. (She leans up against it and grabs it.)