These 5 Actors Didn't Just Play Real People — They Sat Down With Them First

Leonardo DiCaprio Basically Got Coached By The Con Man Himself

Frank Abagnale Jr. was reportedly skeptical DiCaprio could pull off his charm — the real Abagnale admitted he didn't think DiCaprio was 'suave' enough for the role. But the real Frank still ended up woven into the finished film: he even makes a cameo, playing the French police officer who arrests his own onscreen counterpart. Despite Hollywood's usual embellishments, Abagnale himself signed off on the result, calling it '80% true.'

Julia Roberts Met Erin Brockovich On Set — And Immediately Made It Weird (In A Good Way)

When Erin Brockovich showed up for her cameo as a waitress, Julia Roberts broke the ice by joking about her push-up bra costume, saying she was "so embarrassed" because she didn't "even have my boobs in yet." Brockovich later said Roberts didn't just copy her mannerisms, she actually understood the emotions underneath them, especially in the film's raw 'I'm sick' scene, where Brockovich says she could see the exact passion she'd felt in real life reflected back at her.

Will Smith Bonded With Chris Gardner So Hard, He Rewrote A Scene On The Spot For Him

Smith first fell for the idea of playing Chris Gardner after seeing him interviewed on 20/20, and reportedly told Gardner directly, "I'm going to learn your story and I'm going to tell your story." That bond paid off on set: when the script had Gardner's character discourage his son's basketball dreams, the real Gardner objected mid-shoot because that's not what his own mother taught him, and Smith backed him up, insisting the scene change to the now-iconic 'don't ever let somebody tell you you can't do something' speech.

Sandra Bullock Almost Passed On The Role — Then Leigh Anne Tuohy Pulled A Gun Out Of Her Glove Compartment

Bullock initially turned the part down repeatedly, worried the script would be too "schmaltzy and soft." Then she spent a day with the real Leigh Anne Tuohy, who ended the visit by pulling a handgun from her glove compartment and telling Bullock, "Y'all just need to carry one of these." That toughness reshaped how Bullock played her, turning a potential Hallmark mom into the fierce, no-nonsense force that won her the Oscar.

Loretta Lynn Personally Picked Her Movie Double — Then Taught Her To Sing Like Her

Loretta Lynn chose Sissy Spacek for the role based on nothing but a photograph, reportedly pointing at Spacek's picture and declaring, "That's her, that's the coal miner's daughter." Spacek then spent an afternoon tape-recording Lynn telling stories to nail her voice and accent, and Lynn personally coached her guitar-playing and insisted the studio let Spacek sing every note herself instead of dubbing in the real thing — a friendship that lasted the rest of Lynn's life.