The mispronunciation of Frankenstein's name is an allusion to a line from O Jovem Frankenstein (1974).
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 "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.
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.
The Creature in this film is referred to as Prometheus. The full title of the original novel was "Frankenstein: The Modern Prometheus," but this epithet was meant to be applied to Victor Frankenstein not the creature.