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"10538 Overture"
As far as I can tell, the French horn part in this (at least I think it's a French horn) has the same motif as that in Richard Strauss' Also Sprach Zarathustra - C, G, and then an-other C an octave higher than the first one.
It might just be a coincidence, but some of the cello parts near the end contain a phrase from "Frère Jacques" - the part that corresponds to "Frère Jacques" in the lyrics - C D E C.
Lyrically, there's some resemblance between "10538 Overture" and the Beatles' "A Day in the Life." Roughly, both are about a man's death related through the news. "A Day in the Life" starts out with "I read the news today, oh boy" where "10538 Overture" has "Did you hear the news that came across the air today?," and where "A Day in the Life" has "He blew his mind out in a car," "10538 Overture" mentions that "Someone has been found on the rocks down in the bay."
"Nellie Takes Her Bow"
In the middle section, there's a quotation and then variations on "God Rest Ye Merry, Gentlemen."
"Whisper in the Night"
This is the first of at least three ELO songs that contain the phrase "midnight sun." Here, it's in the line "Face the midnight sun." It's also in "So Fine" ("We'll find the land of the midnight sun") and "Do Ya" ("I've seen babies dancin' in the midnight sun") - both from A New World Record.