Head to head to the Southeastern-most portion of the Acter Industrial Park. This area is largely slummish with alot of the geography not being used in the storyline etc. This spot is really off the beaten path - I'll definitely post a picture of the map with some notation to help find it.

Back here is a cylindrical tank with the label "Toxic S**t" - at least they're honest. This one is almost impossible to see if you are not in between the tank and the wall so Rockstar hid it well.

Because they don't warrant their own posts I have two other minor 'eggs'. The first is the presence of "Belly Up" Fishing company's goods in the new Liberty City. If you recall that's the old Triad brand - you can find the crates in the East Hook.

The second is the "VINEWOOD" backdrop from San Andreas on the Tilt-a-Whirl ride at Firefly Island.