When Vixen is locked up in the dog pound, the socks that the elves put over her ears in order to disguise her as a dog are no longer on. When Santa arrives to release her, they're back.
When the gang leaves Snow Miser's place, Jingle Bells's clock reads 11:45. While the gang is at Heat Miser's place, Jingle Bells's clock reads 10:30.
The belt Jingle puts around Vixen's neck in order to pass her off as a dog is gone in the next scene.
When Jingle Bells, Jangle Bells, and Iggie are sitting on the bench after Santa went to the pound, Jingle Bells clock's hands are pointing at 10 and 2 in the first shot, and then they change to 10 and 6 in the next.
Mother Nature tells Snow Miser to allow snow fall in South Land when the town is called Southtown.
Jingle and Jangle show up in Southtown on Sunday, then go to Iggy's school. Either the cop gave them a smart response when he ticketed the elves, or Iggy attends the only school in the world that's open on Sunday. Either way, something's wrong.
When Heat Miser is singing, he touches the moon and it melts, however it melts first away from his finger/hand; it rightly should melt where his finger/hand first touch it then melt bit by bit further away from him.
Jingle tells Jangle to take his socks off in order to use them to disguise Vixen as a dog. When Jangle is wearing his socks, they are red with black stripes. When the socks are placed over Vixen's ears, they are light brown. This is because Jangle turns his socks inside-out before placing them on Vixen, as seen briefly in the close-up.
Snow Miser refers to Heat Miser as his step-brother. Heat Miser refers to Snow Miser as his brother. When Mother Nature summons the Misers, each addresses her as "Mother". If Heat Miser is Snow Miser's step-brother, Mother Nature cannot be the biological mother of both. But it is customary for step-parents to adopt their step-children as their own, if they are of a certain age.
During the "Blue Christmas" song the little girl is writing the word blue Christmas with a crayon. As she writes the word Christmas, the letters appears to appear before she writes them.
When the elves first approach the children in the schoolyard, the flag is extended out like the wind was blowing, but it makes no movement.
When it shows the night sky, the fishing line used to hold up the stars in the background are visible.
When Mrs Clause asks Mother Nature to intercede in her quest to get it to snow in SouthTown...Mother Nature refers to it as South LAND.
When Heat Miser eats two pieces of fire, a fishing line used to suspend the second piece of fire he eats is clearly visible.
When Mother Nature talks to Snow Miser & Heat Miser about letting it snow in the South & letting the North Pole have a nice Spring day, she tells each brother the wrong thing: She tells Snow Miser to provide snow in the South (he would have done that anyways) when she should have told him to allow it to be warm at the North Pole for a day. She then tells Heat Miser to provide a nice Spring day at the North Pole when she should have told him to allow it to snow in the South for a day.
Mrs. Claus makes 2 big mistakes which causes a lot of the problems. First she sends the elves Jingle & Jangle down to the "real" world to gauge if people still care about Christmas & Santa, even though they've lived at the North Pole their whole lives & are obviously not very worldly. She should have gone herself instead. Her second mistake was sending them both riding on Vixen, the baby reindeer instead of using one of the adult reindeer.
Why would Santa employ a doctor who tells him: "Nobody cares about Christmas anymore... wouldn't surprise me none if nobody even believes in you anymore."?
When the doctor arrives to tend to Chris, he removes the oral thermometer that Mrs. Claus was using to take Chris's temperature and inserts his own. Why he thinks his is any better is a mystery.
Actually Mother Nature may be addressing each son correctly. Snow Miser would have to send snow to South Town, which never had snow, and Heat Miser would have to send sunshine to the North Pole.
Even tho Snow says Heat turns his snow to rain or another system, it still requires Snow to send the cold weather to South Town to begin with. Same way Snow will have to allow sunshine at the North Pole.
During Heat Miser's song, many times the character's mouth movements don't match the audio.
When Mrs. Claus picks up Iggy in her sleigh, she asks the reindeer pulling it to say "Hi." It's mouth moves, but no sound is heard until a few seconds later.
When Snow Miser is doing his 'song & dance', and is spinning in place, the pin holding his feet to the floor can be seen clearly.
While it is evident that Heat Miser allowed snow to fall on Southtown, there is no indication Snow Miser allowed warm, springlike weather on the North Pole in return.
The Mayor tells Jingle, Jangle, and Iggy that it hasn't snowed in Southtown in 100 years. A newspaper headline later says it snowed in Southtown for the first time ever.
When Jingle, Jangle and Vixen see Southtown for the first time, Jingle is able to read a sign that identifies the town despite the fact that he is hundreds of yards up in the air and the sign is facing away from him.
It's never explained how Santa knew that Jingle, Jangle, and Vixen wound up in Southtown.
Mother Nature spells out the conditions of the 'weather swap' I.E. Snow in Southtown, warm north pole, the Miser brothers both object "I won't do it" Snow Miser maybe but why would Heat Miser? Those were his exact conditions all along.
Mother Nature tells Snow Miser to allow snow in Southtown, and Heat Miser to allow a warm day at the North Pole. But that's backwards -- it would be Heat Miser allowing snow in Southtown and Snow Miser allowing warmth at the North Pole.
When Mrs. Claus is talking about how all the children from around the world were making gifts for Santa, she says "From East (they show a child dressed like a cowboy) and from West" (they show a little child from the orient). They should be switched - West-cowboy, East-Oriental.
When Jingle, Jangle and Vixen arrive in Southtown they approach a woman to ask her if she has any Christmas spirit. Southtown is a warm weather town 365 days a year, yet the woman is dressed for cold weather wearing a hat, a full length coat and has her hands in a muff (Which turns out to be a live cat!).
When Santa reads the card from the sad little girl, the words written on it are "I'll have blue Christmas", the word "a" is omitted.
Before the final song when the parents are given Christmas gifts, both gifts are wrapped in baby shower paper with the words "for your shower" written on them.