Rapunzel and Pascal traveling back in time in different bodies is reminiscent of the popular television series 'Quantum Leap.'
A magic hourglass was also the catalyst for time travel in an episode of 'Steven Universe' and the third 'Harry Potter' book/movie.
When the young Varian appears outside the caravan, a music box is playing the chorus of his song, "Let Me Make You Proud", from "Queen For a Day".