A framed pictured of Teal'c is clearly visible behind Dr. Keller while she is telling everyone about the disease.
The title of this episode, Tabula Rasa, is Latin and means 'erased writing tablet' in English, usually translated as 'clean slate'.
The species name of the Latin binomial (Rodneyana villosa) proposed by Dr. Katie Brown for the new cactus species, as used on several already-known Earth plant species, means "hairy". Other examples include Nepenthes villosa and the Villosa Lilac.
A framed picture of Jacob Carter is in Sam's office.