Revealing mistake: When Tsukiko's neighbor has his eyepatch removed, the prosthetic makeup for his scarred face and eye looks incredibly fake and unconvincing, and you can tell his bulging eye is just a painted piece of plastic with fake skin around it.
Revealing mistake: In addition to the chain and lock not being in a position to actually secure the entrance to the "Metro Christian Shelter", the board covering the entrance does not appear to be securely attached to the building on the right side. Furthermore, when the men move the board over, it is a rather thin piece of plywood/board that can easily be kicked in. (00:17:17)