What's up with the low-quality picture?

According to the technical aspects data, this movie was filmed using 35mm film. However it looked like it was actually shot on video, because of the very soft contrast throughout the entire film. Now it's possible the mastering of this movie on DVD included in The Amicus Collection was just not very good. I find it difficult to believe the quality of the mastering for both "Asylum" and "And Now the Screaming Starts" (the other two movies on DVDs in the set) could be so sharp, crisp, and vibrantly colorful compared to the dull, VHS-mastered look of "The Beast Must Die" unless TBMD was actually produced on videotape. Does anyone know why "TBMD" looks so bad?

(I know the day for night sequences weren't very convincing, but all of the interior shots looked very bad also.)