The demo like version was Battle Mechs (I think, correct me if I’m wrong)
the campaign in legacy also featured Golden and silver boxes (until the last level which featured a red mythical one), these boxes contained ACTUAL items and still remained the chances of getting a mythical
In the loading screen when you start the game, there is a rocket firing drone from legacy crashed on the ground
In the main menu, there are blue prints of legacy stuffs composed of a Red Angel drone from legacy and the starter drone (the drone you are given once you completed the tutorial in legacy) and a mech
There are also ammo packs in the main menu background (which isn’t a thing anymore since reloaded)
There are also 2 drones on the sides of The Dry Lands background
Starts below are not Easter eggs I just thought it would be nice to list them
There used to be a feature where Torsos have different slot stats, for example, Newbie torso had 1 side weapon slot while Commando (upgraded orange version of Newbie) had 2 side weapon slots, and only Ultra Gladiator (the best torso in the game at that phase, this was before when the Galaxus model series and the stampede series came, heck, this was even before shotguns were a thing)
The teleport effects in the guide now uses the new teleport effect rather than the old wire frame one
There were actually green themed torsos and legs in legacy
Not sure if the torso that was hung was an Emerald, it looked different, Emerald (counterpart of Ruby in Legacy) had an exposed side of pipes with green lines on them, it had 2 eyes on the side rather than 1 running down the front of the torso. Not to mention Emerald actually had small pipes with green dots on the front arranged like a smile, however, the torso that was on the crane was definitely in legacy because it looked extremely familiar (most likely around level 20-25 in legacy’s item shop)