Clare describes what happens when the kids are locked up in a moving metal box as "the Kraken that is unleashed", a paraphrase of the line from the movie: "Unleash the Kraken!"
When they play classical music in the RV (Mozart's Piano Concerto No 21 in C Major), one of the girls says "This is like being in a movie". This piece is heavily featured in "Elvira Madigan" and has come to be known as the "Elvira Madigan Concerto".