Applicability: As the only book of the Bible about the future, the events depicted are really confusing and each have dozens of interpretations. Loads of fiction thus loves to call attention to elements of Revelation in their story, though usually just the most well known elements like Armageddon, the Antichrist, and demons.
Broken Base: Is "The man named John," John the Apostle? There's been quite a debate over this.
Is the Book genuinely intended as a prophecy of the future, or is it a stealth Take That at Emperor Nero? Note that "666" corresponds in Jewish numerology to "Neron Kaisar," the Greek form of his name.
Common Knowledge: In canon, the white horseman is actually Conquest, but popular culture knows him as Pestilence. Perhaps because Conquest's schtick is already kind of covered by War.
It's not called the Book of Revelations, as many think, it's The Book of Revelation. "Revelation" isn't in plural.
At no point is anybody by the name of Antichrist ever mentioned in this book. However, "Antichrist" is used to describe those who deny the Second Coming, i.e., anti-Christ.
The Rapture is also not in Revelation. It comes from Paul's letters to Timothy. note And the La Haye/Jenkins "Left Behind" conception of same is a belief that only was voiced by Evangelical preachers in North America starting in the mid 19th Century
"Armageddon" is not the name for the final battle between heaven and hell, but the Greek name for Mount Megiddo, a mountain in Israel where said battle takes place.
"Apocalypse" means "unveiling" or "revelation", not "supernatural world-ending disaster".
Harsher in Hindsight: The book features a toxic meteorite named Wormwood, and as conspiracy nuts never tire of reminding us, Chernobyl means Wormwood.