Jason and Marceline is set in Avon Oaks, a fictitious town in Pennsylvania based on Norristown, where Spinelli grew up. The time is around 1985, something the reader learns when Jason mentions that the spacecraft Pioneer left the edges of the solar system two years earlier. Pioneer 10 left the solar system in June 1983.

The plot of Jason and Marceline is basically episodic; that is, it consists of what is really a series of short stories without too much unity between them except that all are episodes in the ninth grade life of Jason Herkimer. In the course of the novel, Jason, the narrator, matures, even though in many of the individual episodes he seems very immature.

Although Jason and Marceline is not as accomplished a novel as Spinelli's Newbery Award-wining book, Maniac Magee, it is still enjoyable to read, especially because of its humor. It is written in language fairly simple to understand, the kind of language a boy like Jason would use, and it uses the kind of language that a ninth grader would employ, including slang. Because of this, several reviewers of Jason and Marceline call the book "crude," and at least one writes of its "locker-room talk."

Jason refers several times to the Star Trek television series and movies, and he sees his own sexual adventures as a kind of Star Trek exploration. He refers to the movie versions of Dr. Jekyll and Mr. Hyde and The Bride of Frankenstein, allusions that may help clarify some of the conflicting emotions Jason feels throughout the novel, especially during the times when he and Marceline are having problems and when they are not going together.

Jason and Marceline treats forthrightly some aspects of entering adolescence that may make some readers uneasy. It treats experimentation in drinking beer and relatively harmless sexual experimentation. It involves interracial dating when Peter Kim goes out with Jewel Fiorito. In Marceline McAllister, it presents a very self-assured, mature young woman. At times, her maturity contrasts markedly with the immaturity of Jason and some of his friends.

Jason and Marceline is a sequel to Space Station Seventh Grade, published four years earlier. The later book contains the same characters, but they are two years older. In Space Station Seventh Grade, Jason and Marceline meet. At first they are not at all friendly. In fact, Jason imagines that he detests Marceline. But before the book ends, they discover that they are greatly attracted to one another. That attraction matures even more in Jason and Marceline.

Keller, John. "Jerry Spinelli." Horn Book 67 (July-August 1991): 433-436. This discussion of Spinelli's becoming a full-time writer and a writer of fiction for young adults does not mention Jason and Marceline, but its discussion of Space Station Seventh Grade casts some light on the sequel.

Review. Publishers Weekly (November 28, 1986): 78. This favorable review calls Spinelli's young adult characters "fresh and funny, sometimes crude, sometimes poignant, and always very real."

Spinelli, Jerry. "Newbery Medal Acceptance." Horn Book 67 (July-August 1991): 426-432. Spinelli reviews in general terms his career as a writer for young adults and the sources of his ideas for his works.

T[wichell], E[thel] R. Review. Horn Book 63 (March-April 1987): 217. This favorable review calls Jason and Marceline "the equally funny and often earthy sequel to Space Station Seventh Grade."

Unsworth, Robert. Review. School Library Journal 33,6 (February 1987): 95. Unsworth warns that the novel may offend some adults, but young adults "will love it."

W[ilms], D[enise] M[urko]. Review. Booklist (January 1, 1987): 712. Wilms recognizes that the social struggles Jason finds himself involved in are "meaningfully depicted."