Trivia: The line "Hold on to your butts" said by Samuel L. Jackson is also said by him in Jurassic Park.
Trivia: Anthony Daniels once again portrays C-3PO, making him the only actor to appear in every Star Wars film to this point. He also plays C-3PO for a brief cameo in Rogue One.
Trivia: Edward Hyde tells Nicholas that he is a younger man. In real life, Tom Cruise is two years older than Russell Crowe.
Trivia: There were rumors right up until the release that the film was a prequel to the 2004 superhero movie "Hellboy" - in no small part because both films feature an amphibious man played by actor Doug Jones as one of the lead characters, and both films were also directed by Guillermo del Toro. Despite the widespread speculation, del Toro consistently denied any plot or character associations between "The Shape of Water" and the Hellboy films.
Trivia: Diana is never referred to by any character as "Wonder Woman" in the film.
Trivia: A character briefly mentions Ryan Gosling in the film. This is a bit of an inside joke, as the film's co-writer Ryan McHenry also created a popular meme based on Gosling called "Ryan Gosling won't eat his cereal."
Trivia: At the scene where Jake and Roland are walking through the rusty theme park in Midworld, there is a huge sign saying "PENNYWISE", the name of the demon clown from "It", also by Stephen King.