Emily Longeretta SPOLER ALERT: Do not read if you have not watched all five episodes of “Candy,” now streaming on Hulu.“Candy” viewers knew that star Melanie Lynskey’s real-life husband, Jason Ritter, was appearing in the new series — but they didn’t expect to see Justin Timberlake, Jessica Biel’s husband pop up as one of the other cops working the case of Betty’s murder.As it turns out, it was Timberlake’s idea to join the true-crime show. While the duo often share scripts and notes with each other, this time was a bit different.“He loved the the episodes too, and said, ‘Who’s playing this guy?’ And I said, ‘Oh, I don’t know. Probably an Atlanta local.