OAKLAND – There’s a lot of action in this summer’s blockbuster “Spider-Man: Homecoming.” So blink and you might miss it.

But one sharp-eyed movie-goer noticed the cover of a textbook that the superhero, a student in the film, is studying as he dangles upside down during a scene.

It’s “Living Chemistry,” an actual textbook co-written by Jan Coonrod, a faculty member at Oakland’s Bishop O’Dowd High School.

The textbook also is used in classes at the Catholic school on Stearns Avenue.

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Coonrod told O’Dowd’s e-mail newsletter that she wasn’t sure how the book was picked for a movie prop, and thought it was perhaps due to its colorful cover.

She said she liked that the movie focused on Spider-Man’s younger years.

“Usually these movies have a doomsday scenario, but this one is about him struggling to come to grips with his gift,” she told the newsletter.

The book can be seen in this trailer at the 9:33 mark:

“Spider-Man: Homecoming” was directed by Jon Watts, and stars Tom Holland as Spider-Man and features Michael Keaton, Marisa Tomei and Robert Downey Jr.