Continuity mistake: When Katana removes the armor off her, it lies in pieces around her feet on the ground. However, in a later shot, when she comes out wearing her eye mask and katana strapped to her back, the armor disappears altogether.
Other mistake: In the credits for "Tests," the "created by" credits for the characters of Anarchy and Katana are swapped: Mike W. Barr and Jim Aparo are erroneously credited for creating Anarchy (when in fact they created Katana as part of the comic "Batman and the Outsiders" in 1983), while Alan Grant and Norm Breyfogle are incorrectly credited for creating Katana. (Grant and Breyfogle created Anarchy in issues of "Detective Comics" from 1989.)