Trivia: The contract in the film stating no film can be made of The Mousetrap until 6 months after the theatrical run ends is actually true in real life as well, albeit only referring to English language versions. To date there have been Bengali and Russian films made of the play. The Mousetrap has been running near-continuously since it began, except for a break during the pandemic of just over a year.
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)