'Ahead Of Its Time!' -- Need a Frank Capra expert

(I love the film and remember seeing Capra's stuff in school way back.)

I've recently revisited "Our Mr. Sun" as shown on Youtube.com and on Internet Archive (archive.org).

At 52 minutes in is Father Time's speech on how Earth is "just right", shown with nine Solar System objects -- Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune ... and The Moon!

"Now, that's odd," I thought. If the graphic was showing the planets of the Solar System, one certainly would have expected to have included Pluto. Pluto had been discovered in 1930 and rapidly declared a planet -- no group seriously challenged that until after the year 2000.

But it was ESPECIALLY odd because ...

At seven (7) minutes in, while Mr. Sun rants about how scientists had interrupted humanity's adoration of The Sun as a god, a graphic is shown of the orbits of the Solar System: Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus ... and finally Neptune. No Pluto.

* * * * *

Well, those eight planets DO have nice orbits that are pretty circular, while adding Pluto would have been a little disruptive -- if it wasn't shown as tilted to the plane of the others, it would be seen as inaccurate, but if it was shown as titled, the diagram would look a lot more complicated.

And, in 1954, Pluto was a pretty recent discovery. If Mr. Sun was upset over what had happened over the centuries, then the graphic could be explained as "what scientists had done for a long time".

Besides, both graphics left out the Asteroids, and if Father Time was talking about where humans could have wanted to live, The Moon would be worth considering.

But those last paragraphs are pure speculative reasoning on my part. What was the REAL reason Capra left Pluto out?

Consider this ...

In this one respect,

"OUR MR. SUN"

was at least FIFTY years AHEAD of its time

by not including Pluto in its list of planets.

(Pluto was declared not a planet by the International Astronomical Union in 2006.)

* * * * *

Again ... for any experts out there, or any one that might know ...

What was Capra's real reason please?