Mechanicals are the final artwork for a graphic project that is to be reproduced, usually consisting of a light-weight illustration board with all of the camera-ready paste-up artwork (the type, illustrations and photostats) attached in their final positions, with the overlays indicating color attached.
These mechanicals from 1968 for the window card movie poster for "Yellow Submarine" are different from the released version of the poster in that the quote, "It's All In The Mind, Y'know," is mistakenly credited to Paul McCartney, rather than George Harrison. The mistake is noted and corrected on the translucent overlay. This mistake is of some interest given the recent controversy with the crediting of authorship of certain Beatles lyrics. Inside the apple -- to the right -- there is also the statement, "A Dozen Beatles Songs." This mistake is noted and corrected in pencil. The final version of this poster would later read, "Eleven Beatles Songs."