All versions:

The 1987 animated feature:
  • Awesome Music: While occasionally unnoticed by viewers and having virtually no available soundtrack, the movie has what is arguably one of the most beautiful scores to be heard in a film. Notable examples are when the BFG makes the nightmare for the queen and when the BFG leads the RAF to Giant Country. Pretty funny, considering that one of the composers was one of the members of Herman's Hermits.
  • Big-Lipped Alligator Moment: As the soldiers fly into Giant Country, they pass a random family of dinosaurs. There are no dinosaurs in the original book and their appearance is never addressed.
  • Ear Worm: The song "Whizzpopping" will get stuck in your head for hours on end. So will "Sometimes Secretly".
  • Heartwarming Moments: The ending, where Sophie decides to stay with the BFG, even though, as he himself states, he has no palace or other comforts to offer her.
  • Uncanny Valley: Due to being rotoscoped, the queen, the Paras and the Royal Guards look very unnatural in the cartoonish setting of the story.
  • What Do You Mean, It's for Kids?: Despite it getting a "suitable for general audiences" rating, younger children will no doubt find scenes of the monstrous children-eating giants, from the movie adaption, terrifying.

The 2016 live-action film:
  • Adaptation Displacement: This film takes a few cues from the 1987 Animated Adaptation - such as Sophie having short brown hair (it's long and blonde in the book), a scene where Sophie witnesses the death of a child, the BFG giving Sophie a new dress to wear and the ending where BFG goes back to live in Giant Country instead of England.
  • Memetic Mutation: When the Spielberg film's trailer came out, people unfamiliar with the source material started to make tongue in cheek speculations about the meaning of the acronym title. The Big F*cking Guy and Big F*cking Giant being the most popular ones. And of course, Doom fans complaining that it's impossible not to hear that title and think of The Big Fucking Gun.
  • One-Scene Wonder: Penelope Wilton as the Queen - who doesn't appear until well over an hour in and has maybe fifteen minutes of screentime.
  • Slow-Paced Beginning: For some, the film starts off rather slowly but kicks into gear around the time Sophie and the BFG enter Dream Country.
  • Tough Act to Follow: This was following the 1987 animated film, which is considered a children's classic and the only Roald Dahl adaptation to get a standing ovation from the author.
  • Visual Effects of Awesome: The entire film, particularly the Giants, who at times it's genuinely hard to tell they're CGI at all. In particular is when Sophie and the BFG share the screen together.