The best way to watch the series is in chronological release order: Back to the Future (1985), Back to the Future Part II (1989), and Back to the Future Part III (1990). The story is continuous, with each film picking up exactly where the previous one left off, making it essentially one long 6-hour movie.

Director Robert Zemeckis and writer Bob Gale chose the DeLorean DMC-12 because its stainless steel body made it look like an alien spaceship to the people of 1955. Additionally, the gull-wing doors allowed for the visual gag where Old Man Peabody mistakes it for a UFO. Originally, the time machine was going to be a refrigerator!

The series uses a single mutable timeline theory. Changes made in the past ripple forward and alter the present (the 'Ripple Effect'). If you change something significant, like preventing your parents from meeting, you can erase your own existence. This differs from the 'multiverse' theory popular in modern sci-fi where changes create separate timelines.

It is highly unlikely. Co-creators Robert Zemeckis and Bob Gale have famously stated that they will block any attempts to reboot, remake, or continue the film franchise as long as they are alive, believing the trilogy is perfect as is. However, the story has continued in comics and video games.

While we don't have flying cars yet, Part II correctly predicted: video calls (Skype/Zoom), biometrics (fingerprint payments), wearable tech (VR/AR glasses), drones, flat-screen TVs, and arguably the Chicago Cubs winning the World Series (they won in 2016, just one year off!).

Eric Stoltz was originally cast and filmed for about five weeks. However, the creators felt his performance was too serious for the comedic tone they wanted. They made the difficult decision to replace him with their first choice, Michael J. Fox, who filmed the movie at night while shooting Family Ties during the day.

Real-world hoverboards like the ones in the movie (that float freely without magnetism) do not exist yet. However, magnetic levitation boards have been created (like the Hendo Hoverboard and Lexus Slide), but they require a special copper or magnetic surface to work. The 'hoverboards' sold today are actually self-balancing scooters.

The Flux Capacitor is the core component that makes time travel possible. Invented by Doc Brown after he hit his head on a sink in 1955, it consists of three flashing glass tubes arranged in a 'Y' shape. It requires 1.21 gigawatts of power and a speed of 88 miles per hour to initiate temporal displacement.

The fictional town of Hill Valley was primarily filmed on the Universal Studios Hollywood backlot (Courthouse Square). Other locations include the Gamble House in Pasadena (Doc's 1955 house), the Puente Hills Mall (Twin Pines Mall), and various residential streets in Los Angeles and Pasadena.

Why 88 mph? According to the production crew, it was chosen simply because it was a cool, memorable number that was easy to read on the digital speedometer. There is no deep scientific reason within the movie's lore, other than it being the speed required for the DeLorean to break the time barrier.