Ethan Shanfeld SPOILER ALERT: Do not read if you have not watched the series finale of “The Rehearsal,” titled “Pretend Daddy.”“I started to feel like I was solving a puzzle of my own design,” Nathan Fielder says in the series finale of “The Rehearsal.” He’s dropping off his fake son at a Jewish school. Driving right behind him is the kid’s real mom, who immediately picks him up to take him to his real school.Nathan wants to feel like he’s dropping his kid off at Jewish school so that he feels like a “good Jew,” an insecurity stemming from an issue with his former co-parent, Angela, for whom the entire simulation was originally built.