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In this first episode there are communications (phone calls, of a sort) between people on the moon, and people on earth. They are depicted as completely, and instantly conversational (just like a normal phone conversation on earth). In reality, the distance between the earth and the moon (and the limitation of light speed), means that when one person finishes talking, it will be approximately 2.5 seconds before the other party will begin to hear their response (and that is if the other person starts to talk, the instant that the other party finishes). Obviously, those delays increase, the further one travels from earth, such that eventually, conversational communication becomes completely impractical.