Thanks to Matt Schichter for sending over the following.
Between 2003 and 2014 I interviewed a lot of musicians and actors, and I've recently put the whole archive online with full transcripts.
Since DarkUFO is still the place Lost fans gather all these years later, I thought you might like my 2011 interview with Mark Pellegrino. He talks about auditioning for the Lost pilot years before Jacob existed, working with Michael Emerson, and shooting Jacob in Hawaii while flying back and forth to play Lucifer on Supernatural in Vancouver.
Audio and full transcript: https://mattschichter.com/interviews/mark-pellegrino
There's also a 2013 phone interview with Titus Welliver that opens on the Man in Black, though it's mostly about Deadwood and Argo: https://mattschichter.com/interviews/titus-welliver