FACT Source
Keys That Go Nowhere
Looting practice dummies during the missions "Knowledge Is Power" and "Hunting the Hunter" grants the player keys, leftover, dummied-out content that serves absolutely no purpose in the game.
All Knowledge
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LORE Source
The Doge's Frozen Chessboard
Glitching into the Palazzo Ducale's private quarters reveals the exact chess position from the cutscene where Carlo Grimaldi assassinated Doge Giovanni Mocenigo, though the candle they played under is oddly unlit, and the sky outside turns blood red, likely an unintended lighting bug.
FACT Source
Why It's Called the Gravemind
The name of the Flood's central intelligence wasn't lifted from any existing mythology, it was coined by Bungie staff writer Jaime Griesemer specifically for the character. The Gravemind is voiced throughout the trilogy by actor Dee Bradley Baker, known for his extensive voice work across animation and games.
FACT Source
Xur's Design Echoes Resident Evil's Merchant
The weekend exotic vendor Xur, hooded coat, backpack, and unsettling stare, bears a strong visual resemblance to the mysterious Merchant from Resident Evil 4. His tentacled face has also been noted by fans as a nod to Lovecraft's Cthulhu Mythos.