All of the Zompyre characters (with the notable exceptions of Mombi and Wayne Shepards) are named after characters from Shakespearean works.
At no point in the film does Evey fire a single shot from a gun.
The character of Laertes was not in the original script, but the script did call for several shots fired off screen, and the directors decided to use the same person to always be firing the shots. Thus the character of Laertes or (Evil Boyd) was born.
The green liquid in the vial was created by mixing a highlighter with water, and letting it distill.
Harper Lee's Novel "To Kill a Mockingbird" can be seen on the lab workbench in numerous shots throughout the film.