Radio Bart - S3-E13
Continuity mistake: At the start of the scene where Bart talks to Rod and Todd on the radio, their shirt colors switch. (00:08:50)
Continuity mistake: When Homer laughs at Patty and Selma, for a few frames you can see that the beer can he was holding is gone. It stays beside the phone for the rest of the scene. (00:07:00)
Suggested correction: When Homer is laughing at Patty and Selma he never has the beer can in his hand. He has a drink then the camera cuts to Marge talking about Patty and Selma, Marge then walks out of the shot, and we get a close up of Patty and Selma. The shot then changes to Homer who starts laughing. Enough time to put the can down.
Continuity mistake: There are three mistakes when court is dismissed: 1) the people standing around disappear, 2) the two men with Fat Tony disappear for one shot, and 3) when Bart says that crime doesn't pay, Marge is suddenly standing beside Bart. (00:20:35)
Suggested correction: There are also 3 corrections here. 1) the only people standing near the bench are Lionel Hutz and Seymour Skinner. Seymour is simply out of shot and Hutz is on screen. 2) Legs and Louie don't disappear they remain standing on the steps but due to the camera angle that is now looking across the steps rather than up the steps so they are out of shot. 3) There is a close up of Bart and Fat Tony long enough for Marge to walk over.
Continuity mistake: When Lou and Eddie (the police officers) arrive at the house to take Bart for a drive, their badges are white. When they are driving in the cop car, their badges are yellow. (00:05:30)
Like Father, Like Klown - S3-E6
Continuity mistake: When Reverend Lovejoy gives Bart a t-shirt "Gabbin' about God", Bart puts it behind his back, where it disappears in the blink of an eye. Look closely (pause helps), but it definitely does disappear. (00:13:40)
Continuity mistake: After Lurleen sings 'No-One Understands You', she puts on her apron and picks up a tray. On the tray, there are three bottles of beer. But in the next shot, Homer goes over to Lurleen, and there is only a cup. (00:07:15)
Radio Bart - S3-E13
Continuity mistake: When Homer, Marge and Sting are down the hole and Sting is digging, Homer is wearing a vest. But in the next shot when they find Bart and Homer moves Sting out of the way, he is wearing a shirt. (00:20:50)
Continuity mistake: As Homer and Marge are about to get married, Homer disappears for one shot. (00:10:20)
Burns Verkaufen der Kraftwerk - S3-E11
Continuity mistake: When Horst looks at the pot full of green slime, his mustache disappears for three separate frames. (00:10:00)
Burns Verkaufen der Kraftwerk - S3-E11
Continuity mistake: When Bart starts dreaming what he can do for $5,200, Marge has disappeared from beside him. (00:04:35)
Lisa's Pony - S3-E8
Continuity mistake: Homer's digital watch disappears when he enters the auditorium. It also vanishes in the first shot of Homer in the music store. (00:05:05 - 00:06:25)
Lisa's Pony - S3-E8
Continuity mistake: After Homer watches the tape, Marge suddenly appears beside him. (00:07:30)
Tree House of Horror II: A Simpsons Halloween - S3-E7
Continuity mistake: At school, there are two rows to the right of where Bart is sitting. This keeps changing from two rows to one row during the entire scene. (00:11:00 - 00:12:15)
Like Father, Like Klown - S3-E6
Continuity mistake: When Bart and Lisa go to see Rev. Lovejoy, the objects on his desk keep disappearing/reappearing. (00:13:05)
Continuity mistake: Bart puts his lucky red hat on the hat holder. It disappears in the next shot. (00:07:10)
Continuity mistake: When Homer jumps in the car having completed the Fatherhood test and drives off to see Bart race. The car shifts from reverse to forward without Homer moving a gearstick. (00:18:40)
Burns Verkaufen der Kraftwerk - S3-E11
Continuity mistake: When Mr Burns is bowling outside with other old people confronting him, he drops the ball in front of him. In the next shot the ball is further away from him. (00:15:00)
Like Father, Like Klown - S3-E6
Continuity mistake: When Krusty has a cigarette during the cartoon just before he is reunited with his father, he keeps his cigarette pack in his shirt pocket, 'close to his heart'. When Krusty and his father hug, the cigarette and the packet are gone.
Continuity mistake: Homer goes to ring the phone number '1-909-WIN-BIGG' but we see he only presses four dials, and that's all we hear too.
Lisa's Pony - S3-E8
Continuity mistake: When Homer is phoned by Lisa, the color of the phone is blue. Immediately after, it turns to green. (00:19:00)