In the Footsteps of a Killer - S6-E7
Character mistake: Jack asks which one of the two saints is the Saint Ursula venerated in Saint Marie, and mentions the Ursula martyred by the Huns, and Ursula Micaela Morata, with the gift of bilocation. Being this thoroughly informed, he should know that the second is not a Saint, but a Venerable. (00:17:20)
Character mistake: The first term served by Dwayne's father is typo'd as 4 RS instead of YRS. (00:15:25)
Character mistake: In the first scene in the office of the dead banker, Jack is not wearing any gloves and touches the cufflink box freely without any precaution. (00:04:40)
Character mistake: Florence says that Commissioner Selwyn Patterson and Martha are halfway through the bottle, but the bottle is practically empty. (00:29:55)
Character mistake: The web listing for the Brompton cigarettes says that they went through a "rerevival." It's a typo, not a colourful way to say for instance "second revival". (00:24:10)
The Secret of the Flame Tree - S6-E2
Character mistake: Florence says that the verses Esther was researching were 'halfway through' the book, but Humphrey opens a page in the last 1/4 of the book. (00:29:40)
Answer: There's probably no particular reason. Sets and props on long-running TV shows often change as needed and for various reasons throughout a series run.
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