Every scriptwriter on “Better Call Saul” knows their number will come up twice each season. For Alison Tatlock, learning that she was in line to write one of the last episodes of the show’s sixth and final season brought back memories of her days as a film brat from Brookline. As a teenager growing up with a single mother who was studying at Boston University’s film school, Tatlock was a punk-rock kid who worked at the Coolidge Corner Theatre. There she devoured the informal cinema studies of the late David Kleiler. When she found out she’d be writing “Nippy,” the “Better Call Saul” episode that aired in late July, “I did feel a bit of a thrill,” Tatlock said last Monday, on the day of the AMC series’ penultimate episode. “Because it seemed special, weird, and potentially funny in a way that I really love to write.” Click the link in our bio to read the full story. 📸: Greg Lewis