The name of the episode, 'Trinity,' refers to the name given to the first nuclear test in history.
The set used for the planet Ronan and Teyla visit is the same one used in Stargate SG-1 (1997) where Daniel and Vala discover the Ori. Both were filmed around the same time.
The planet visited by Teyla and Ronon is called Balkan, a reference to the Balkan Peninsula in Europe.