I occasionally get the idea that the people that produce Christmas specials don’t always grok the way the universe works.
Yeah, Santa, flying reindeer, yada yada yada. We all stopped believing that stuff by the age of eight. But what are some of the less obvious things?
The one that gets me is sunlight. At the North Pole. In late December.
As a kid, I always stressed out, worrying about the kids without fireplaces. How would they get gifts from Santa? (the film The Santa Clause cleared it up nicely for me - I actually felt relieved although I’m middle aged and don’t really believe…)
Here is an oldie but a goodie.
Well, even if reindeer could fly, the sleigh would be dangling behind them, with Santa clinging on for dear life to the back fender … unless they were going extremely fast I guess.
Like Bumbles can *really *bounce. Sure.
Not physics but biology:
The Rudolph special shows trees and animals like rabbits and racoons at the North pole. There isn’t even any land there.
Santa Claus is coming to town also I think has an unrealistic depiction of the North Pole. And how did they get the huge blocks of granite to build their castle all the way up there?
Obviously a wizard did it. I mean, there’s a freaking wizard in the story.
Even as wee lad, I wondered how Herbie managed to pull all the Bumble’s teeth without there being any bleeding. And how Frosty was supposed to ride a train all the way to the North Pole.
That ain’t bad physics, it’s bad astronomy (or bad geography, depending on how you look at it).
Well, if he puts one foot in front of the other, soon he’ll be walking 'cross the floor…
You’ll pay for this, Superman. Oh, how you’ll pay.
Art Carney’s version of Santa posited a villiage not at the North Pole proper but rather an extremely remote area of either Alaska or Canada and ringed by glaciers.
That film also positied a sled that was self-propelled (but don’t tell the reindeer that), a matter transporter for homes with no chimneys, and a time-slowing device.
Obviously, he took the Polar Express, duh 
Your typical roof wouldn’t support a reindeer, let alone a fully-laden sleigh. And, hello? not flat.
Ha! I read the whole post before I clicked the link and wondered where you saw any of that in this Twilight Zone episode! 
*and can I just note that reading the synopsis for that ep, I got a little chill? I’ve seen that episode at least five times in the last decade, during TZ marathons on various cable stations, and the power of it to send chills of wonder down my spine never, ever fades.
More psychology than physics, but in all those movies where Santa Claus is real but the parents don’t believe in him, where do they think all those presents came from?
Allow me to be the first to go 
Well, if you take movies like Miracles on 34th Street as a guide, it’s clear that other people are giving out presents as well as Santa. And it’s generally some middle-class or rich kid who disbelieves; Santa probably concentrates his resources on kids who wouldn’t get presents otherwise.
Even better!