After entering the prison block (where Mysterio is hiding), choose any character with claws. Hitting the yellow-blue switch will open the door - behind them you will find the Green Goblin (Ultimate) character token.
Deadpool Red Brick
In the same location turn right and walk to the cupboard standing near the wall - smash it and then switch your character into Venom. Pass through the symbiotic wall to the next room -you will find the "Token Detector" Deadpool Brick there.
Stan Lee in Peril
Choose any character with electric powers and charge up the battery placed near to the cell on the left. You will set Stan Lee free in this way.