Trivia: The storyboards shown for the proposed "action" finale of the Mousetrap film mirror the actual finale of this film.
Trivia: Narrating in 1969, Kya said, "How birds sing mostly at dawn because the cool, moist air of morning carries their songs and their meaning much farther." This is no longer the primary view. Some scientific research found their subject sparrows' songs were louder (or just as loud) at noon than during the so-called "Morning Chorus." It appears the "Morning Chorus" might just sound louder because there are fewer other sounds at that time of the morning to drown them out (i.e, it is quieter). (00:37:15)
Trivia: The first film in the franchise to feature a female "Pinhead," as portrayed by actress Jamie Clayton, a trans-woman. Despite some minor backlash online, original Pinhead actor Doug Bradley has spoken out in support of Clayton, noting that the franchise has always been transgressive and unique, and that he loved her performance on the show "Sense8." It should also be noted that the Cenobites in the original book were mostly androgenous, though "Pinhead" was said to have a feminine voice.