“CODA” won three Oscars this year: Best Picture, Best Actor in a Supporting Role, and Writing (Adapted Screenplay). When making “CODA,” Marlee Matlin, who won an Oscar in 1987 for “Children of a Lesser God,” realized she was usually the only Deaf person on a set. She told KCRW in January: “I’m the one typically going to my trailer by myself, and it’s just me and my interpreter. But in all honesty, I never thought of it until I got on the set of ‘CODA’ and realized there’s a whole different world out there I’ve been missing all this time. Realizing that here I am, on the set of ‘CODA,’ in my element at lunch time, because everybody is signing. The hearing crew — they’re signing, there’s Deaf cast members, and most importantly, our director learned sign language.” KCRW reairs its conversation with director Siân Heder and Matlin. Also in a new Banter, Matt Belloni talks to Lucas Shaw about what happens now as the WarnerMedia Discovery merger is imminent.