Example:
This page contained various hand signals instructing a painting of a dog. Someone on our team quickly recognized these as Curwen Hand Signs and it is referencing Close Encounters of the Third Kind.
In what possible world is someone encoding a message in an obscure (even if taught in 5th grade) musical notation hand signal format and then a team just happens to have someone that knows that? Rare breed indeed.
It's remarkable all the sorts of crazy things a large collection of puzzle loving people know collectively.
Most of LosT puzzle pages take at minimum an hour to solve. They are designed to pull you in multiple directions when you first receive them.
e.g. https://lostboy.net/ExecutionTwoMiniatureSteelChameleonMuteS...
Look at the image names in the source. They're all actors in the movie Lost Boys. It also has nothing to do with the page and was there to mislead you. That alone takes at least one member of your team down a 20-30 minute rabbit hole.