When “Red, White & Royal Blue” debuted last summer, it did so without fanfare or spectacle, landing squarely amid historic Hollywood strikes that precluded its stars from lending their press-friendly faces to promote the movie. Now, Nicholas Galitzine and Taylor Zakhar Perez are recalling their surprise when they found out their queer rom-com earned an R rating and agreed with critics who said it wasn’t warranted. (May 23)