The jacket design and photography was provided by Arnold Skolnick, who’s best known for the Woodstock poster. His lemon on wheels is a visual pun referencing the (American) English slang term for a car – and by extension any consumer product – with several manufacturing defects. According to Wikipedia, “[i]ts first attribution to mean a problematic car was in a Volkswagen advertisement created by Julian Koenig and Helmut Krone as part of an advertisement campaign managed by William Bernbach” in 1960, see this post on Fonts In Use.
Fun aside: another term for the same thing is a Friday car – based on the premise that the involved assembly line workers had their minds already on the weekend. The German equivalent is a Montagsauto, i.e. a Monday car. Here the assumption is that the workers were still drunk, or had otherwise not yet regained their usual routine after the weekend.
The typeface used on the cover and also for titles inside the book is Cooper Black. Text is composed in Caledonia.