Distinct from the in-game easter eggs page. This focuses on what's hidden in the trailers themselves - audio cues, background details, callback references.
Categories
Audio cues - radio fragments, background dialogue. Background detail - billboard text, signage. Callback references - subtle nods to past GTA games.
Each is small and easy to miss. Frame-by-frame community work has surfaced most of them.
Documenting your finds
If you spot something the community hasn't catalogued, the GTA convention has been short clips with timestamps rather than long-form video. Tools like the GTA 6 clipping tool are built for that pattern - lifting a 6-second beat out of a longer trailer or playthrough so the discovery is shareable without forcing viewers to scrub.