- Ear Worm: Cher's cover of Betty Clarke's "The Shoop Shoop Song (It's in his kiss) will stay in people's heads for a long, long time.
- Hilarious in Hindsight: At the time of the film's release, Winona Ryder was in a relationship with Johnny Depp (which soon ended). A decade later, Christina Ricci, who played Ryder's little sister in the film, would co-star as Depp's love interest in Sleepy Hollow (1999) and The Man Who Cried (2000).
- Retroactive Recognition:
- Values Dissonance: Given the movie's 1960s setting, not a single eye batted over 15-year-old Charlotte dating and later losing her virginity to 26-year-old Joe, nowadays due to the age of consent in many states ranging from 16-18 years old it's very likely that Joe could be charged with having sex with a minor.
YMMV / Mermaids