These guys were all at the beginning of their career, but they all became big stars afterward. Ellen Barkin too. Any other movies that caught so many rising stars before they were big?
I want the doctor to take your picture so I can look at you from inside as well.
The Magnificent Seven - Yul Brynner (already a star), Eli Wallach (not quite a star), Steve McQueen, Charles Bronson, James Coburn, Robert Vaughn
The Last Picture Show - Timothy Bottoms, Jeff Brides, Cybil Shepherd, Cloris Leachman, Ellen Burstyn, Eileen Brennan, Sam Bottoms, Randy Quaid, Clu Gulager, and Ben Johnson (the only star at the time)
The Outsiders - Patrick Swayze, Matt Dillon, C. Thomas Howell, Ralph Macchio, Diane Lane, Emilio Estevez, Tom Cruise, Rob Lowe
Boyz 'N the Hood - Cuba Gooding Jr., Morris Chestnut, Ice Cube, Nia Long, Angela Bassett, and Laurence Fishburne (somewhat famous)
But yes, Diner is certainly among their constellation.
American Graffiti: Richard Dreyfuss, Ron Howard, Harrison Ford, Cindi Williams, Charles Martin Smith, Bo Hopkins (plus I can't leave out the not so young Wolfman Jack)
Say Anything... comes to mind. Ione Skye never became a star, and John Mahoney was already an established character actor, but it made a star of John Cusack, and included the likes of Lili Taylor, Eric Stolz, Jeremy Piven, Philip Baker Hall, Joan Cusack, and Bebe Neuwirth in smaller parts.
Fast Times at Ridgemont High, too. Jennifer Jason Leigh, Sean Penn, Forest Whitaker, Phoebe Cates, Judge Reinhold, Robert Romanus....
It’s A Mad, Mad, Mad, Mad World, starring everyone in Hollywood
Heat
Some Like It Hot
I am responding to the OP headline, and not to the lazy afterthought topic delimitation amendment about “rising stars.”
OP, if you’re THAT fucking intellectually lazy, you are not
worth my time, so you will take what I give you and be happy with it.