Andromeda's AI is downloaded (or more precisely, copied) into an android body known as an Avatar.
The Magog lay their eggs in living beings; the newly hatched larvae eat the host from the inside out.
Nitpick: Rommie uses her artificial gravity field to disable an invading army, a brilliantly effective and (for a sentient machine) effortless tactic. Yet, despite being helpful numerous times later in the series, she'll never do it again.
Harper was infected with Triangulum Measles. It is a protozoan infection of the skin, which, if left untreated, will eat away the skin and internal organs, leaving nothing but bleached bones. However, a combination of radiation therapy and antibiotic ointment can clear it up within three weeks.
The Commonwealth had weapons called Nova Bombs, which are capable of destroying an entire solar system. According to Dylan, they had never been used in combat.
Goof: During the fight between Dylan and Rhade, Dylan shoots Rhade in mid-air. Rhade can clearly be seen to be shot in the stomach. When Dylan rolls the body over to say a last few words to his former friend, the scorch marks show he was shot in the chest.
Dylan states the The Systems Commonwealth consisted of over a million member worlds, in three galaxies. The three galaxies were the Milky Way, Andromeda, and the Triangulum.
It was established later in the series that the Andromeda was frozen in time for approximately 303 years, from CY 9784 to CY 10087.
By the Earth calender, the years in which the series takes place are 5161-5164.