Fun stuff in Monster Hunter Wilds you may not have noticed:
Hirabami shed their skin like bugs or snakes and you can harvest it
They also either sleep upside down by their tail from a ceiling, or by clinging onto walls almost completely camouflaged
Balahara seem to have a behaviour akin to filter feeding in the sand, and the mud they spit is probably said sand
Balahara also have dozens of bright blue clam eyes between their teeth
Gillopods and Pillopods are only seen around the landspines, even outside of Wyveria in different regions. (ie Area X in Oilwell Basin.) They feed on excess wylk
The dragontorch spins and you can see it in the background while fighting Zoh Shia
Nerscylla has Gypceros shaped cocoons hanging from the ceiling of her nest
The jewel beetles in the Scarlet Forest only show up on trees that have sap on them
There's a Dalamadur skull in the Wounded Hollow, so all the bones around Suja and Grand Hub is its skeleton
The Guardian Akveld theme has a heartbeat in it
Nu Udra has her children float at her nest during the Springfest, the same with Xu Wu
When crossing between Iceshard Cliffs towards Wyveria or Suja, you get to walk through the ruined city where Hirabami casually hang out and see the destruction and massive empty moat
Jin Dahaad can show up on the many bridges at Iceshard Cliffs and beat the shit out of other monsters
Guardian Akveld's armour description is VERY different to regular Akrvelds. Gives me the chills
Vigor wasps actively go to vigor plants and collect their sap if they themselves aren't carrying any
Most people probably know this already, but corpses decay, and have a chance to grow fungus or special wylk you can harvest if they decompose in a wylk pool
Wonder how dung appears? Doshaguma have a pooping animation
The palico that revives you runs all the way back to camp in real-time (yes you can follow it)
Some NPCs and your handlers will react to your emotes. Not as much as in Rise (I can't get a rejection to a kissy emote here like from Himiko...)
Sometimes you'll find Kunafa villagers setting out on an expedition in real-time
The wylk pools around ruins of Wyveria change location every now and then
When an odogaron flees it sometimes will climbs the dragonspine
There are certain gathering and mining spots around Wyveria only accessible by using a Seikreit
You can jump/launch yourself off of the fulgurite pillars Rey Dau makes