Dr. Noyce refers incorrectly to two "incidences" of a syndrome; the word incidence is used to refer to a rate or proportion, while separate events, Noyce's meaning, are incidents.
Dr. Stone wonders whether Andromeda is spreading on the ground unilaterally or in one direction (as opposite possibilities); unilaterally, meaning one-sided, is meaningless in this context and certainly not an opposite, but "uniformly" would be an accurate word.