Short answers, pulled from the story.
George Dunning supervised over 200 artists for 11 months during production of the 1968 animated film Yellow Submarine. The film's art director was Heinz Edelmann who pioneered a unique visual style alongside contemporaries like Milton Glaser and Seymour Chwast.
The Beatles made a live-action cameo appearance in the final scene which was filmed on the 25th of January 1968 shortly before the band's trip to India. This was done primarily to fulfil their contractual obligation to United Artists to actually appear in the film.
Yellow Submarine received widespread critical acclaim upon its release in July 1968. The film grossed $993,385 in the U.S. and $282,158 in other countries for a total of $1,275,543 worldwide.
Hey Bulldog was cut from the film before it opened in the US but restored for the 1999 reissue. To the disappointment of fans in the UK the film was presented in its US theatrical version omitting the Hey Bulldog scene when first issued on home video.
Comedian Peter Serafinowicz was cast to voice Paul while Dean Lennox Kelly played John in the cancelled computer-animated remake of Yellow Submarine. Cary Elwes voiced George and Adam Campbell played Ringo in that project.