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Watch anything that's slightly out of focus in the background and you'll notice it splitting into little red, green and blue fringes, mimicking chromatic aberration. It's a deliberate wink at old comic books, which often had their ink layers slightly misaligned during printing, and it's subtle enough that a lot of people watch the whole film without consciously clocking it.
Behind the Spartan number and the legendary Armour, Master Chief has a first name that rarely comes up in dialogue: John. The Gravemind is one of the very few beings in the wider universe ever shown learning and using it, a small but telling detail about how much the Flood's intelligence comes to know about the humans it hunts.
Emily Rose landed the role of Elena Fisher almost by accident, she'd just tagged along to support a friend who was auditioning, and ended up getting cast herself thanks to the chemistry she showed reading opposite Nolan North.
According to Netflix's own engagement reports, season two racked up 234 million hours watched in its first 28 days, well ahead of season one's 166 million over the same window. That makes it one of the biggest jumps in viewership between seasons for any Netflix original.
The 'cargo' on Hollywood isn't cargo at all — it's an Omnic named HAL-Fred Glitchbot who's being escorted through the studio lot while an anti-Omnic group tries to take him out. The name's a little wink at classic sci-fi that's easy to miss if you're too busy fighting over the payload.
Visit Calendar Man in his cell and change your console or PC's system date to match certain real dates, and he'll come out with a unique bit of dialogue tied specifically to that day. One of his lines even tells Batman he'll 'be at your end,' which is exactly the kind of cryptic nonsense you'd expect from a villain whose entire gimmick is dates.
For a while, Pendleton Ward flat out told fans that Tree Trunks was definitely dead. Then the episode "Crystals Have Power" rolled around and quietly walked that back, bringing her into play again like nothing ever happened. Ice King's age got the same treatment, jumping around over the years depending on what the story needed.
Martial arts consultant Sifu Kisu worked on all 61 episodes of the original series. He'd physically act out each fight so the animators had real reference footage to draw from, which is a big part of why the bending choreography still holds up so well.
In the post credits scene, an alien warns Thanos that attacking Earth would be to 'court death.' It sounds like a throwaway warning, but comic readers clocked it as a deliberate pun straight away, since Thanos is famously, literally in love with the physical embodiment of Death in the source material.
