The 2023 TCM Classic Film Festival opened Thursday night with Steven Spielberg and Paul Thomas Anderson as featured guests putting an emphasis on film preservation — and a celebration of Angie Dickinson, who recalled her experience making “Rio Bravo,” the 1959 film that had a fresh Film Foundation restoration premiering as the capstone of the night. The gala at the TCL Chinese Theatre also had TCM host Ben Mankiewicz talking with Warner Bros. Discovery president-CEO David Zaslav about the company’s partnership with the Martin Scorsese-founded Film Foundation on preservation efforts, as the 100th anniversary of the WB studio dominates the...