In the scene where Victor is in the woods saying his vows, he puts his ring on the "branch" aka the corpse bride's hand and he puts the ring on the pointer finger. But in the next shot when she says "You may kiss the bride." the ring has magically moved to her ring finger.
During the dinner scene, as the camera pans up and down the table, we can see that everyone (including Mr. and Mrs. Everglot) have some sort of chicken-like bird on their plate. However, when the "guests" arrive, Mr. and Mrs. Everglott's chicken turns into soup.
When Victor first plays the piano, the arpeggio he plays is actually a C fully diminished. The arpeggio that sounds is C Major.
When Victor practices his vows in the woods, there is no priest present to legalize the vows. Furthermore, only the Corpse Bride says "I do", whereas Victor never does.
During the Skeleton Dance, a trombone is being played. But the sound is of at least two muted trumpets.
When Emily comes down the stairs after arguing with Victor, she leaves with her hands empty. When we see her next; she's carrying a wedding bouquet.
During "According to Plan" when Maudelaine Everglot opens the safe, you see she is wearing a gold wedding ring. However, when she closes it, the ring is gone. It reappears later. The same thing happens to Nell Van Dort. In one shot she has her ring on but in the next it's gone.
When we are first introduced to "Scraps", he is in a wrapped gift box. When Victor drops the box on the ground and Scraps appears, the box soon disappears.
The direction of the sword that goes though General Bonesapart changes between several shots.
When Victor is practicing his vows, he is having difficulty lighting his candle. Victoria, who is standing next to him, is also holding an unlit candle. However, a few seconds later, she surreptitiously lights his candle with hers, which has mysteriously lit itself.
During the Wedding Song, a baker's nose gets knocked off and mixed into the wedding cake batter. Towards the end of the song, while they're carrying the cake through the street, his nose is back with no signs of damage.
When Victor and Barkis Bittern are dueling in the church, Victor scratches Barkis in the chest with a fork, leaving a scratch, but in the next shot, the scratch is gone.
During the wedding rehearsal scene, Victoria's candle is not lit up until Lord Barkis sits down. When the camera shows Victor and Victoria's reactions, her candle is lit.
When Victor is first talking to Victoria, he's fiddling with his tie. In one shot it is out of his jacket and wrinkled but the next time he's shown, the tie is tucked in and there isn't a wrinkle in sight.
When Barkis and Victor are fighting, Victor blocks the sword with the fork, and at first, the blade is to the right of the three prongs. The shot switches away, then back to Victor, and now the sword is between the middle and right prongs.
When the skeleton with the hat is singing, he goes up to the Corpse Bride and grabs the left side of her wedding dress. When the camera zooms in it shows him holding the right side of the dress.
When Victor is taken to the "underworld" a piratical skeleton has a sword in his middle. The sword hilt is facing out of his chest, so the other skeleton could grab it. When Victor goes up and grabs the sword, the sword blade is sticking out of his chest.
In the beginning of the "according to plan" song, Nell Van Dort's fox pelt is unhooked, and in the next scene it is hooked in the front.
When Victor and the Bride are playing their piano duet in the underworld, the notes the Bride's fingers had been playing continue to repeat as her hand breaks off and climbs up Victor's arm.
In all the scenes with a piano, the keys that are played don't sound out the right melody. For example: Victor plays Middle C, but the sound that comes out is not Middle C, but D, sharps and flats are heard coming from white keys instead of black keys, etc.
Emily is shown having a 'sock' on her skeletal left leg, while the right leg is made of flesh, does not have a 'sock' on it, whether its a sock, flesh or just a design flaw is not made clear.