When it came to prom — and a boatload of other scenes, for that matter — Olsen had to make sure that Lara Jean's lipstick didn't transfer onto Peter every time they shared an on-screen kiss, which proved to be a little difficult. To minimize smudging, she explained she blotted down the makeup as much as possible prior to filming a kissing scene.
"You don't want them over glossy, too saturated, and full of lipstick because it's just a heck of a mess to remove on the other person," said Olsen. "I had to go in there several times to tone down his face and his lips." But sometimes some transferring is inevitable: "There's one scene when they're in the tent and they're kissing and I can see a little bit of lip stain on Noah." Oops.