Jeffrey Combs was hesitant about portraying Lovecraft on film. "I don't look like Lovecraft." but makeup made him look like Lovecraft as best as they could. He also wasn't particularly fond of the direction they went with his rendition.
At approximately the 37:30 minute mark (during "The Cold") some violin/synth cords are played as a part of the score. This tune is identical to the closing credits music of the TV show Dexter. Daniel Licht composed both scores. Dexter was released 13 years after Necronomicon.