This is from Lost.
I wouldn't say the planes and subs are easter eggs because they are clearly visible from the condo and require no searching. They could be references to other games though.
By noclipping away from the penthouse but above the kill/teleport hitbox you can get the location of
Breakin'The LawOnce in this location you can noclip down under the ground and move back towards the penthouse without being killed.When in the area where you should be dead but aren't you can get the location
Probably a CriminalAlso there's a little "Outside the Boundaries" location but it's not that secret.
That building out in Highrise is the Tower, and yes I actually no-clipped all the way out here just to find that out
Not sure if it was mentioned anywhere, but the secret salescat has a new unique model
Any if someone doesn't get the reference
I remember that episode. Was good times.
This was mentioned quite a few times.