Note: The following section is considered non-canon or is disputed in canonicity.
When hoping to get Marty and the rest of theBrown familyto mellow out during a heatwave during July of1991, Doc decided they should go toDecember 24,1845afterClaramentioned it being as "hot as thedickens", which inspired Doc to take the family to a Christmas time visit to 19th century London .Doc and Marty borrowed a page from the famous Dickens story, with Marty posing as the Ghost of Christmas to scare Ebiffnezer Tannen.Verne Brown and Marty McFly traveled to France at some point in the 1800s in hopes of Verne convincing his namesake, Jules Verne to change his name. A name Marty suggested was Charles Dickens, which, along with other names suggested by the time travelers, was rejected.
Non-canon or disputable information ends here.
Behind the Scenes
Bob Gale stated in his commentary to Part I that A Christmas Carol was an example of time travel fiction that influenced his interest.
The word "dickens" as used in "Hot as the dickens" has nothing to do with Charles Dickens. As early as the 16th Century, "dickens" was a slang word for Hell.