The telephone in the Masters' kitchen has a modular type handset connector. Modular connectors weren't introduced until 1976, more than twenty years later than the setting of this series.
Ethan talks of a pregnancy as 'an immaculate conception' to mean a virgin birth/becoming pregnant without sex. However, the meaning of immaculate conception is different: it is the belief (conception) that Jesus' mother Mary was without sin (immaculate).