Rather than don a wig or grow his hair long (which would've taken too long), Daniel Radcliffe wore hair extensions for his role as Igor. Because of this choice, he had to suffer the look and wear them as his own hair throughout filming.
The mispronunciation of Frankenstein's name is an allusion to a line from Young Frankenstein (1974).
The "twist" that this movie puts on the classic tale is that it is told from Igor's perspective. However, Igor doesn't appear in the original novel "Frankenstein" by Mary Shelley.
Filmed from November 2013 to March 2014, but no public screening until its release in late November 2015.
Dunnottar Castle in Aberdeenshire was used as the cliff-top castle location. With Slains Castle, it was visited by Bram Stoker in August 1894 and widely supposed to have inspired the castle of Dracula, the other great creature creation.