Deliberate mistake: Florence and Humphrey set up the scene using a printer that is nothing short of magical; the photos, in color, come out from the machine the instant that Florence displays the profile on screen. It is obviously done to speed up the scene - however, Florence could have printed the pictures beforehand and hand them to Humphrey one by one as she reviews on screen the profiles, there was no need to have them come out fresh from the printer with that kind of impossibly fast timing. (00:15:00)
Episode #3.6 - S3-E6
Deliberate mistake: When Fidel pops behind Humphrey with the walking cane, in nonsensical fashion his cane switches hands in the brief moment when the camera moves from behind him to the front of Humph. It has to be deliberate since there is no cut, but Fidel is standing still both times, and Gary Carr must have done a sudden swap that has no reason. (00:28:20)
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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