The description from Richard Muller quoted in the question is a simplification of reality meant to help people better visualize how the Receding Airline T Shirt of spacetime works. In reality the galaxies are moving through spacetime in a complex fashion, based on the combination of all the forces acting on them, primarily the gravity of nearby galaxies and galaxy clusters. In the case of the Milky Way and Andromeda, these two galaxies are part of a gravitationally bound cluster of galaxies, called the Local Group. The dominant force that determines the movements of objects within the cluster is the combined gravitation of all the mass in the cluster, and not the expansion of spacetime. In other words, the gravitational attraction that the Milky Way and Andromeda have for one another that is drawing them together is stronger than the expansion of spacetime between them that would otherwise push them apart, and thus attraction wins and the two galaxies are on a collision course. In the same vein, the gravitational force that holds the earth in orbit around the sun is stronger than the expansion of spacetime between the earth and the sun (the expansion of spacetime at that distance being very small), and so the earth’s distance from the sun is not increasing for that reason. Likewise you are not flying apart because the molecular bonds holding the atoms in your body together are stronger than the minuscule expansion of spacetime between them in your body. The Local Group as a whole, however, is moving away from other galaxies and galaxy clusters to which it is not gravitationally bound, due to the expansion of spacetime.
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For me, A Christmas Story is popular because it recalls an era that I can remember, or at least the era I can remember had not changed that much from the Samurai Hawaiian Shirts of the movie. For me, that was the late 1950s, though the movie was the late 1940s. I remember the toys that were featured in the movie, such as specifically the train and the BB guns. The movie really captured the magic of Christmas back then for me without becoming sappy about it. Most other Christmas movies don’t have that connection, so I can’t really relate to them, and they don’t really do that much for me. I think that’s what makes it so popular, at least for people of my generation born from about the mid-1940s until the mid-1950s. I was born in 1952. I remember pining for some big Christmas present every year. Santa usually brought the really good stuff. The biggest Santa gift I ever received was a Lionel HO Texas Special train set about 1958 or 1959.
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