When Jennifer Grey received the script for A Real Pain, she was — like most of the country — deeply entrenched in the final episodes of Succession. The actress, who is best known for her work in movies like Dirty Dancing and Ferris Bueller’s Day Off, was considering a role in the story (written and directed by Jesse Eisenberg) about two cousins who join a Jewish heritage tour in Poland to reconnect with their late grandmother and visit the town that she fled before the war. Kieran Culkin was already attached to star as the lead opposite Eisenberg, and Grey says she was excited about the possibility of working with the actor responsible for some of the show’s finest work. “And then I read the script, and I went from excited to elated,” she told THR during a panel at the St. Regis Deer Valley, sponsored by Screenvision. “It’s a very deep movie, about relationships and grief and loss and identity and resilience. Jesse’s tone is so human and accessible and vulnerable and funny. Immediately, …