Good catch! The story that Ed outlines to Einstein does indeed sound like Robert Heinlein's "Time for the Stars" (1956). I had to do some quick digging to see if the story might have been serialized earlier in a magazine, but I find no indication of that.
If you wish to contribute the item to the "Anachronism" list, all you need do is go to the "Goofs" page and click the Edit Page link near the bottom.
http://www.imdb.com/title/tt0110099/trivia?tab=gf
Now: When did you start reading Heinlein?
I discovered his books in the early 1960s, in Junior High.
(Do you like Asimov and Clarke as well?)
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"The time has come," the Walrus said,
"To talk of many things,"
Of atoms, stars and nebulæ,
Of entropy and genes;
And whether one can bend space;
And why the spaceship shrinks.
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