Drug use or not, that John Hughes movie, as well “Ferris Bueller’s Day Off,” impacted him profoundly. Fernando Eimbcke’s new coming-of-age dramedy “Olmo” follows a charismatic Chicano teen in 1970s New Mexico. For Uttapa, 17, these interactions seemed authentic; he is a second-generation Mexican American whose grandmother came to the U.S. from Mexico, while his mother was born here. “I’ve gotten some auditions here and there about Mexican American or Latino characters, but if I’m being honest, none of them really clicked to me as much as it did with Olmo. And while Eimbcke may very well be the Mexican John Hughes, there are certainly uniquely Mexican, and perhaps unexpected, references that were foundational for him as an artist.