To obtain a character token, you have to find and arrange three special newspapers. The first one is hidden on the back-right corner of the room -to get it, melt the golden radiator and construct the newspaper from the debris.
Walk to the opposite side of the room and destroy a silver cardboard box placed in the corner. Now create the second newspaper.
Finally walk to the office in the front of you and build the last newspaper. The character token for Doctor Octopus (Ultimate) will appear in the middle of the bureau.
Deadpool Red Brick
In order to find Deadpool brick, enter the office with Deadpool hidden inside and use Jean's telekinesis power to put nearby chalices in to the right places (the color of basis should be the same as on chalice). Now You will receive the "Studs x4" Deadpool Brick.
Stan Lee in Peril
You will find Stan Lee under the pile of sand in the right side of the room. Choose Wolverine or any other character with claws and dig a hole in that pile. This will set Stan Lee free.