I have discovered 5 easter eggs on my own or steps

1.- How to activate the turrets
2.-close the steam valves in the airship with the special weapon (I don't know what this is for other than that when you decompress the air, it doesn't slow you down)
3.- Flares (which work like mortars)
4.- If you throw grenades at the central fountain, it gives you money or takes away, from +200 to -2000 (although someone posted this just when I was going to mention it)
5.-Music disc on the shelf where the special weapon is built, I honestly don't know what to do with it, when you pick it up it just disappears.


All my findings here in this video: https://youtu.be/SVppPiUwhZM


I would like to explain it better, but I speak Spanish and I use a translator xd and what better a video to watch