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The portrait of Michaela, that Andrew/David carries, is actually the same portrait of Jane Seymour from the movie "Somewhere in Time".
Becky's mother appears in this episode, but she supposedly died in the episode "Father's Day."
It was around the time period of Dr. Quinn that the Ku Klux Klan originated: 1866
Earthworms are hermphroditic, but reproduction does not happen quite as Dr. Mike describes. A hermaphroditic worm cannot reproduce by itself. It must "couple" with another worm, and then they fertilize each other. Each will lay a "cocoon" full of eggs following cross-fertilization.