In the source story, the aliens are short and look like hairy pigs that walk upright, and go by the name Kanamit (singular: Kanama). In this televised version they're called Kanamits (singular: Kanamit), and they all look like Richard Kiel, wearing a prosthetic "big brain".
The newspaper that Patty picks up is the actual June 14, 1961, edition of "The Los Angeles Times." The top-most headline reads; "Specialist Checks John F. Kennedy's Back." The main banner headline reads; "4-HOUR POWER OUTAGE BRINGS CHAOS TO N.Y.," which refers to the previous evening's power failure in New York City.
The establishing shot - of New York City's Time Square area, is stock footage from 1949, as both visible movie marquees (The Strand in the upper-left), as well as the Globe Theatre (mid-left) are showing 2 films; ( My Dream Is Yours (1949), and Champion (1949) (at the aforementioned cinemas, respectively) which were both playing at that time.
The trivia items below may give away important plot points.
In 1976 Owlswick Press, Philadelphia, published a book titled "To Serve Man: A Cookbook for People" by "Karl Würf" (ISBN 0 913896 05 5, LCCN 76-004348). It contains 71 recipes, all using people, including Mannerschnitzel, Chile con Hombre, Arabian Tomato & Infidel Soup, Hungarian Ghoulash [sic], and Blood Sausage. It is dedicated to Damon Knight, "for the name, the title and the kind permission to use both". Adding to the joke is the fact that the Library of Congress classifies it, not as a satire, parody or literary work, but as a cookbook (call number TX652.W83), in the company of 5,306 other culinary works. This means that the cataloging librarian either didn't have a clue or else had a sense of humor. ("Karl Würf" is a pseudonym for the late science-fiction author and editor George H. Scithers.)
The source story ends with the declaration "It's a cookbook," spoken calmly and sardonically by a male colleague of the narrator. The line is retained, but its delivery and setting are different, in this televised version.