There's a giant nail thing sticking out of Sebastian's palm in the Butcher picture. It's right behind the revolver, if you look closely.
Form the Fat Haunted picture, Sebastian has what looks to be a giant metal bolt, almost bug like,on top of his hand. Hopefully these zoom in's help.
I can see the nail slightly in the butcher pic but I think its part of the background while the 2nd one with the fat zombies it still hard to make it out. But I think its a glitch.