This TV special was the epilogue for the fourth Peanuts theatrical film, Bon Voyage, Charlie Brown (and Don't Come Back!!) (1980).
The last two digits of the license plate number of the car the Peanuts gang rent indicate it is registered in the Manche department of France, where Omaha Beach is located.
Charles M. Schulz was a World War II veteran, although he was not deployed to the active front until the very end of the war, after D-Day was already complete.
The gang visits the same town and chateau that Charles Schulz was stationed at during World War II.
Among the items shown in Charlie's bedroom is an autographed picture of a baseball player. The picture is signed "from Stan." It is not known who Stan is, but he's not Charlie's favorite player from the comic strip, "Joe Shlabotnik."