That looks like damage from a sprocket or something on the sprocket wheel. It could be on the master (unlikely) but is likely on the dupe created for distribution. At some point the film may have jumped off the sprocket while running and it damaged the stock. It'll move from bottom to top for the duration the object was hitting the film.It's the Christmas episode from season 2 (Disc 2) titled 'An Old Fashioned Christmas'. I've circled in red an example of it.
My original MGM set isn't accessible at the moment, but I assume it's present there as well.
It's small and not objectionable, but hard to unsee when you notice it. But mostly I was just curious what the heck it was.
There's also a small "crinkle" above and to the left of that bit of damage. Does it move too? If so, it's likely something was stuck on a sprocket wheel hitting the film as it was transferred.