 When Batou and Togusa are exploring Kims mansion, Batou finds a  figure that resembles Motoko Kusanagis appearance from  _Kôkaku kidôtai (1995)_ (qv), along with a row of numbered cards  reading "2501". In the original Ghost in the Shell, Project 2501 was  the code name given to the Puppet Master project and became the code  Batou and Kusanagi agreed to use when they wanted to contact one  another.