- Actor Allusion: One of the puzzles is based on "Beauty and the Beast". The game stars Robby Benson and Tony Jay, who had recently appeared in the Disney version of that story. (Mind you, the Beast in the game was actually voiced by someone else) though a Nonstandard Game Over can cause Alexander to become a beast himself.
- All-Star Cast: The CD version was one of the first video games to use one.
- Fan Nickname: The Cliffs of Logic are often known by fans of the King's Quest series as "The Cliffs of Copy Protection".
- Keep Circulating the Tapes: The version available from GOG Dot Com intially packaged the DOS version, which lacks the high-resolution character ports and interface of the Windows version. Fortunately, users could access it through ScummVM. GOG did later issue a version using ScummVM with the Windows version.
- My Real Daddy: The game was largely written and designed by Jane Jensen rather than Roberta Williams, and fans generally consider it the best in the series.
- Promoted Fanboy: Jane Jensen was inspired to enter the video game industry after playing King's Quest IV: The Perils of Rosella.
- Talking to Himself: Don Messick voices the Sense Gnomes, as well as Ali.
- What Could Have Been: There were earlier drafts on the game script that were different than in the final product, such as differences in the puzzles (for example, there were clues on the walls of the Catacombs that would tell you how to move around the Catacombs) and in the storylines (e.g., the copper Daventry coin had the face of Queen Valanice rather than King Graham; Alexander sending a wrong poem to Cassima; the old coins being made out of gold rather than copper; the black feather remaining black rather than changing color after stirring in the teacup of the Magic Paint mixture; and the "Drink Me" Potion bottle being empty, forcing Alex (and the Pawn Shop Owner) to go into Plan B, i.e., Faking the Dead rather than a Faux Death). In spite of this, many of these drafts either changed or never came into fruition at all. All of these can be found in the Novelization of the game in the King's Quest Companion Booklet.
- The original plan for the Winged Ones was to have them be entirely albino, looking rather like ancient Roman statues whose paint has worn off—with marble-white skin, white hair, and blank white eyes. This was even to extend to their clothing. In the final game they look more like actual flesh-and-blood Romans instead.
- The Wiki Rule: The King's Quest Omnipedia.
Trivia / King's Quest VI: Heir Today, Gone Tomorrow