The super-glue scene is referenced in Small Favor (Dresden files) a book by Jim Butcher. A female character is disembowelled and talks about super-glue being invented in the Vietnam war in order to stick wounded soldiers back together but then says she saw it in a movie about werewolves.
Neil Marshall chose to use dancers as the werewolves instead of the typical stuntmen in order to highlight their grace and elegant movements. The set was also designed size-wise to force the creatures to have to bend a bit upon entering thereby highlighting their statuesque physiques and wore stilts in their costumes that made them a foot taller.
In the scene where Wells asks Cooper to knock him out, Kevin McKidd (Cooper) throws a stage punch the first time, but misjudges the distance of the second and catches Sean Pertwee (Wells) on the nose. Pertwee didn't feel the punch however as he really was drunk for that scene.
Some of the corpses hanging around in the basement were originally created for and used in Event Horizon (1997). Actor Sean Pertwee was in both movies.
There is very little CGI used in the movie because the people involved in the filming believed that CGI was being over-used at the time and that it would take viewers out of the movie because they would be focused on how the special effects looked rather than the story, thus the werewolves are animatronics and body suits with stilts.