I was just watching the Through the Looking Glass episode again, and I noticed something for the 1st time.
The keypad that Charlie uses to type in the code to disable the jamming equipment isn't a standard computer or telephone keypad. The keypad he uses is a 4 by 4 grid. The keys are numbered from 1 to 16! 16! Why would a keypad be numbered like that?
I don't even know what to think about that. Was it built by people that use hexadecimal math? Is it related to the 4 toed statue? Why haven't I heard theories or something about this keypad before?

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