Since this is going to revealed I might as well show 4 secrets I found. The first is where they show the nuke and the crazy hillbilly.
On the nuke there's a Disaster Lab Logo on the it. Click it.
Right before the Gazel Ministry leaves for bowling there is a screen that appears in the background. Click that.
This one is a bit harder. During the bowling room you must wait until the G.M leaves. When they exit the screen right behind thme hidden is a small red box thingy. Click that.
Last one. "Hey guys! Look what I snuck onboard!"