A dust jacket was a type of cover used on hardback books to prevent dust from settling on the main cover.
Grays Sports Almanac came with a dust jacket that was identical to the book's cover, which fooled Marty McFly when he was trying to recover the book in 1955. Marty watched Mr. Strickland take the book, flip through it, carry it to his office and throw it into the wastebasket. When Marty finally recovered the book, he found instead that all he had recovered was the dust jacket, which Biff had used to cover a copy of the erotic magazine Oh LàLà instead.
Behind the scenes
- The saleswoman at the Blast from the Past antique/memorabilia store in 2015 remarks that the dust jacket is an unusual feature. The almanac is a soft-bound book, with the thickness of a magazine, which could be folded and carried in one's back pocket. It was unusual, even in 1989 (when Part II was released), for a "paperback" to have an additional cover.
- A dust jacket was a common feature, prior to 2015, on hardback books. The copies of A Match Made in Space, seen in 1985 after Marty's return from the past, have a dust jacket with artwork on the front, and a black and white photograph of the author (George McFly) on the back.
- In an early draft of the script, the almanac was described as having 5,000 pages (albeit of ultralight paper), making it more likely that it would have had a dust jacket and more likely to have 50 years of sports statistics. However, it would have been less likely for Biff to carry a hardback book with him everywhere, let alone to put it in his pocket.