Batman Arkham City Easter Egg - Hints to Scarecrow's Survival

Egg 1
1. In the Industrial District, there is a building going to the North. It's a flat roofed building, no significant markings. You can see the Cathedral, Strange's Tower and the Cranes of the Docks from the roof.
2. Grapple up to the roof and look for the hay bales. On the furthest to the edge, there is Scarecrow's mask. It's ripped but you can distinguish it as Scarecrow's.

Egg 2
1. Once Protocol 10 has been activated and you're trying to get to the Tower and confront Strange, grapple onto a Tiger Helicopter.
2. Try and get towards Gotham Olympus. Scattered around the surrounding buildings and streets there are dead thugs.
3. Look over these thugs, they have been murdered brutally. On their faces are brown masks, just like the Scarecrow's. This suggests they were killed by Crane's fear gas and he put the masks on them.