Audio problem: The ghost of Christmas past says "these are but shadows... they are what they are - do not blame me." Her mouth keeps moving after she stops speaking.
Suggested correction: No, it doesn't. When she finishes this speech at 45:16, there is an immediate cut to Scrooge. We can only see the back of the ghost. Her mouth is not visible.
Suggested correction: A mouth can move without speaking, not an audio problem but a puppeteering problem that is not a mistake.
A puppeteer problem would still be a mistake.
Maybe for the puppeteer, but in the movie it is no problem because a mouth can move without sound coming out. So what exactly went wrong?
But practically speaking people (or puppets) don't just flap their mouth open and closed with no reason. The overwhelming probability is simply that there was a dubbing error or a line was cut and the dialogue didn't fit with the mouth movement.
The mouth opens 1 extra time. That's all.
But it's glaring enough to be noticeable. Regardless of how or why it happened, it's a mistake.
In the version on Disney+, there is an immediate cut to Scrooge as the spirit finishes her speech. We only see the back of the spirit's head. Are you seeing something different on other versions?
https://www.youtube.com/watch?v=hBDqCFyugW0. I got the scene right here, it's at 1:50. Judge for yourself. I can repeat that part over and over again, but to be honest, sometimes it looks like there is an extra movement. Sometimes I can't see it. Even if it was, muppets move their mouths without speaking all the time.
Audio problem: Seb and Mia are watching "Rebel Without a Cause", and the scene shows Jim Stark driving up the ramp to the observatory. The music playing at that moment is the original track from that movie, but it is not synchronized properly with the visuals. (00:51:06)
Audio problem: When they are playing "Patience" for Curtis, he is holding a drink in his hand. After he shuts the music off, when he moves the hand holding the drink, you can hear ice clinking in the glass. However, you can plainly see that there is no ice in his drink. This happens a couple times in the scene.
Audio problem: During the "Shock Treatment" musical sequence, look carefully at Dr. Nation McKinley's (Patricia Quinn) lips at the end of her solo speaking part. She mouths words to the song, even though the only voice you hear is Dr. Cosmo McKinley's (Richard O'Brien).
Audio problem: During the scene where the newsies find out that Jack has turned scabber, Weasel asks David if he'd like a new suit of his own. David yells "Never. I'm not like you." But his mouth isn't moving when he says "I'm not like you." (01:33:35)
Audio problem: After the mermaids splash Wendy, she raises a seashell threateningly above her head and says "If you dare come near me again.". Her mouth doesn't move at all.
Audio problem: In Notes II, Madame Giry voice is out of sync as she says,"Fear his fury.".
Audio problem: Fozzie and Kermit are driving right towards Gonzo and Camillia. When Fozzie says, "Yeah, cute huh?" if you look in the mirror, his mouth doesn't move.
Audio problem: The original audio track for the saloon scene towards the end was accidentally lost during filming. Because the film was largely ad-libbed, not all of the lines could be recalled when the scene was dubbed in post production. As a result, lip movement is matched rather poorly to the audio.
Audio problem: When Satan and Saddam leave the room, after the 'I can change' song, Saddam says "I love you" yet his mouth never moves. (00:54:00)
Audio problem: At the end of the scene on the hotel balcony between Darcy and Balraj, Darcy's voice said "Not exactly, no" but his mouth says "Absolutely not, no." (00:14:55)
Audio problem: In a shot during the scene with "Big Girls Don't Cry," when Frankie Valli sings, "Baby, I was cruel," the soundtrack is going, they're dancing, but Frankie is not singing - or at least, his lips aren't moving. (01:00:20)
Audio problem: During the Spoonful of Sugar song Mary stands in front of a mirror and sings along with her reflection. Her reflection sings "they find." but the mouth movements do not match. (00:33:30)
Audio problem: When Davey is burping in the china restaurant and all those people's glasses break, you can hear the glass break at least 1 1/2 seconds before any glass actually breaks.
Audio problem: During the Second Chances song, when the 1st female singer sings the words "Second chances!" her voice is that of the 2nd female singer. (00:50:45)
Audio problem: In the very first scene of the movie when Bobby is recreating his performance at the Coconut Grove, the actions of the band are out of sync with the music we hear. (Bobby is in sync, but the band is not.) Watch the hands of the drummer and the band leader: The entire scene is out of sync, but when the drummer moves to the ride cymbal you can easily see he is ahead of the music, and when the band leader gives the band cues for accents, his hand movements are behind the music and therefore happen too late.
Audio problem: While Bing Crosby sings "White Christmas," he is playing the piano. However, the piano is never heard.
Audio problem: There is a clear lip-sync problem in the boat scene, after Eugene takes out the lanterns.
Audio problem: In the last scene when Vlad, Michael and Ellen are swimming, Michael is talking as he enters the water. His head dips under water, but you can still hear his words.
Audio problem: When we see the moth singing on his way to the bar, his mouth doesn't move.