Trivia: The house with the blue door (William's residence) was formerly the home of the movie's screenplay writer, Richard Curtis.
Trivia: Spike Jonze is uncredited in the movie for his role as Jerry.
Trivia: This is Rachel McAdams' third time travel film (she also stars in The Time Traveler's Wife and Midnight in Paris), but her character hasn't time traveled in any of the films, it's always someone else.
Trivia: As Rocky flies his tricycle over the fence to aid Ginger with the launch ramp, he flashes the European "flipping the bird sign" - index and middle fingers extended - to Mrs. Tweedy.
Trivia: When the movie played in theaters, there was a scene where Dr. Catheter begins to tell Billy about the gremlins before the movie is interrupted by gremlins until they are threatened by Hulk Hogan. When the movie was released on VHS, the scene was changed to static appearing and gremlins constantly changing the channels. This caused many people who bought or rented the movie to think there was something wrong with the tape and took it back to the stores they purchased it from.
Trivia: The first MCU movie to feature the word "fuck", when Quill tells Nebula to "open the fucking door", a line that was improvised on-set and kept in because it was so funny. James Gunn anticipated being told to cut it out, but Kevin Feige left it up to Gunn's discretion. Feige said the Russo brothers had a "fuck" in an early cut of Avengers: Endgame, but they "didn't want that to be their legacy, so if you want that to be your legacy, then sure." James Gunn said that just made him even more keen to keep the line in, at which Feige "laughed his ass off."
Trivia: Even though Frank the pug doesn't appear, there are a couple of references to him. The first one is a big picture of him over J's bed and when J gets pulled over by the cops, there is a billboard advertising for "The Amazing Talking Pug." (00:22:35 - 00:40:25)
Trivia: At the start of the first scene, when Nisi serves the customer she calls Nate, he is played by Rudy Ray Moore, known for the title role in the 1975 film Dolemite one of the most popular Blaxploitation films of the 70s. After Nate refuses the burned toast, Mickey tells Nisi, "Girl, don't pay him no mind, he thinks he's Dolemite." Also, note the name "N. Townsend" on Nate's uniform patch, which is the last name of the director, Robert Townsend.
Trivia: This movie was originally supposed to be part of the TV series "Amazing Stories" but Steven Spielberg like the story so much that he decided to make it a full length film.
Trivia: During the opening musical number, Tracy passes a man on the sidewalk wearing a trench coat who then flashes the crowd; this is John Waters, the writer and director of the original 1988 version.
Trivia: The actress playing Connie has the same surname as her character - Moreau.
Trivia: Throughout the whole movie, the cars in the backround are Volkswagon Beetles.
Trivia: When Shaun is on the phone to his mum, Ed shouts "We're coming to get you Barbra". This is a tribute to the famous "they're coming to get you Barbra" line from Night of the Living Dead (1968).