Factual error: When The Oneders are recording their song with Uncle Bob, there is an In-N-Out cup sitting by the recording equipment. There are no In-N-Out restaurants in PA.
Visible crew/equipment: After Rick is introduced to Lew Eisen, when Eddie/Joe sees Lew he tries to evade him. When Rick catches up with Eddie, there are at least five actors' T-marks visible on the ground. (01:29:20)
Other mistake: Carolyn Stilton shoots Blondie O'Hara in the head and is lying dead over her dead husband. Just before the final scene starts she begins to open her eye.
Revealing mistake: Towards the end when Vanilla Ice jumps the motorcycle over Nick's car, you can see the ramp he used through the car's windshield.
Factual error: In the scene where the young Helen Goff is traveling by train with her family, it's obvious that an American engine and coaches have been used, instead of a Queensland Rail locomotive of the era. None of the QR locomotives had flared smokestacks like on the one seen in the movie. The coaches are also incorrect - as far as I know, none of the Queensland Rail wood coaches had clerestory roofs with a set of windows in them like seen in the movie. When Helen looks out the back of the train, it's also obvious that the tracks are spaced at 'standard gauge' (4' 8.5"). They should be closer together, as railways in Queensland are built to 3'6" gauge instead. There is also no such company as the 'Queensland Victoria Railway Co', as marked on the coaches, as all railways in Australia are state owned.
Continuity mistake: In the scene where Lucy sang and won the $500 competition, when they are announcing she's the winner they show a far away picture, and Lucy has the money in her hand. Then they show a close up picture, and Lucy doesn't have the money - the announcer does, and then hands it to Lucy.
Factual error: An old man appears with children following him. This is supposed to be pedagogue Janusz Korczak. It appeared as if he was just wearing a suit and a Jewish arm band. In the Warsaw Ghetto, Mr. Korczak never wore an arm band and wore his WWI Polish Army Uniform, both as acts of defiance. He was beaten and almost put to death (he had connections) for not wearing an arm band so having one on in the movie is inaccurate.
Factual error: When Madonna greets her audience for the kick-off night of the Blond Ambition World Tour in Tokyo, we're actually seeing the second show, not the first.
Continuity mistake: At the beginning, Ray holds out a ticket for the bus driver to see. In the next shot, from behind, both Ray's hands are at his side. When the shot changes back to the front, his right hand is extended again holding the ticket.
Factual error: The frozen treats used at certain points in this movie are labeled with nutrition labels found in the U.S. today. The labels looked extremely different in the 70's.
Continuity mistake: It is supposed to be night when Joe slips out of the hotel, but a daytime sky is visible.
Factual error: After Berry and one of the Country Bears get in the bus to find the others, they show a scene with the bus going along a road and Berry leans out the window. Here you can see the side of the bus is spick 'n' span clean. Then, later, the bus is as dirty as it was when it left the shack, very noticeable at the start of the carwash scene.
Factual error: During the first scenes of the film the Greek flag used is the current one, and not the one used at that time. The flag that should have been used is a white cross on blue.
Factual error: What on earth is the conductor at the premiere of the 9th doing with a baton? This was not used until around 1849, and the premiere of the 9th is in 1824.
Visible crew/equipment: When Len, Eddie and Len's henchmen get out of the van they are in, you can see the camera crew (including soundman) filming in the reflection of the van's surface.
Factual error: When they show the Nelson Eddy song 'I Love You', the set/movie shown is Rose-Marie. But that number is from Rosalie not Rose-Marie. Two totally different movies - one set in West Point not with the Canadian Mounties. There are no Cole Porter songs in Rose-Marie, likewise there are no Mounties in Rosalie. Rose-Marie's music was by Harbach / Hammerstein II / Friml / Stothart. (01:09:25)
Continuity mistake: At the Unicorn Bar Evie takes a photo of "Drumstrings" Casey performing as Faye-Jean dances in front of him. Both Drumstrings and Faye-Jean are facing Evie with Faye-Jean holding a beer bottle over her head in her left arm. Later when Evie looks at the photo, it has been taken from the side and Faye-Jean is facing a different direction, no arms above her head and is not holding a beer.
Continuity mistake: At the end when Michael Jackson is singing come together, at the end of the song his shirt is undone, but when the camera shoots back on him his shirt isn't ripped.
Audio problem: When Lola is on stage performing Eliza Rocks, she turns her head away from the audience and quickly whips it back. As she is turning her head away her lips are not moving, but the song continues.
Continuity mistake: When all of the dancers are preparing for the showcase dance, Nora walks in with hair that has her usual bounce. When she and Lucy are talking in front of the mirror, her hair is almost completely straight, sporting just a few slight waves. When Tyler approaches her backstage, her hair is extra curly. It has only been a few minutes, and there was not enough time for her to have curled it. This is confirmed in the commentary.