Markle has often referred to TV producer Lindsay Jill Roth as her "best friend." The pair met when they were both studying at Northwestern University, and their friendship was sparked when they took the same Toni Morrison literature class in their freshman year. Roth later moved to New York, but she revealed in a 2017 interview with People, "We're the kind of friends who can be 3,000 miles away and still be talking about or thinking the same thing, and even texting each other the same thing at the same time miles away."
Roth appears in the docuseries and wrote on Instagram to mark the premiere, "I often get asked what Meg and H are like. Here's your chance to hear their story from them! Watch 'Harry & Meghan' on @netflix." In the doc, Roth explains that before meeting Harry, Markle was intent on having a fun, explorative summer where she got to "be free." Once she met Harry, Roth recalls, Markle was "giddy."