At the height of her stardom, Jennette McCurdy landed a spin-off Nickelodeon show called “Sam & Cat.” She tells Nightline Co-Anchor Juju Chang that it was a period of her life where she was often comparing herself to her co-star Ariana Grande. The latest episode of Nightline— streaming now on Hulu—looks back at their conversation about Jeanette’s life and memoir, “I’m Glad My Mom Died.” | Nightline