The dilapidated building the Blood Junkie resides in was actually an abandoned glue factory. The director actually ran into trouble with the police while scouting it, and had to obtain permission from the owner to film there.
The actors' period clothing was obtained from a thrift store.
The frog spearing scene was achieved by the director cutting out a section in the spearing stick, then using a wire hanger and hot glue mechanism to insert the frog into the empty section.