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It could be that the author is highlighting the similarities between the two. It could be creative provincialism (A U.S. writer not knowing that a British person would not say that, or vice versa)...
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#3: Attribution notice added
Source: https://writers.stackexchange.com/a/44161 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/
#2: Initial revision
It could be that the author is highlighting the similarities between the two. It could be creative provincialism (A U.S. writer not knowing that a British person would not say that, or vice versa). It could be that strange minds think alike (An example from Spongebob Squarepants where both Patrick and Mermaidman independantly believe "Wumba" is the opposite of "Miniturize" or in Archer, where upon learning that the situation involves the Prime Minister of Italy, several characters independently offer up they though Italy was still a Monarchy with the same reaction of "Wait, I thought Italy has a King.") Another example is that it's an early installment weirdness, where the series is in it's infancy and still trying to find it's voice and proposes concepts and ideas that are later excised and made impossible. It could even be that authors and writers have styles that can be observed with increased familiarity with their works. Joss Whedon, for example, has a reputation for killing off innocent and fan beloved characters in horrible ways. Greg Weisman (who does a lot of Cartoon Works) has a fondness to Shakespeare References and villains' who kick off the episode plot to distract from their real goals.