When the steel door crashes on the floor after the SEALs blew it up, you can see it is actually made out of wood.
After watching Nikita's debriefing video on the Tablet, Leonardo Santo asks Owen/Sam, what her name is. Owen/Sam says that he'll need to buy the Black Box in order to obtain that information. However, Nikita's name is clearly visible in the lower left corner of the Tablet's screen.