Jeff Gulka plays a strangely prescient little boy in this episode. He had played a similar character the year before in the season 5 finale of The X-Files (1993) as a psychic child prodigy in The End (1998).
The device used to summon the Tok'ra is the same one used to summon the Nox in Enigma (1998). The viewers know that because, when Martouf gave the device to Sam, he told her it came from the Tollan. Also, when the device is projecting the beam, it is the same footage that was used in that episode.
The iris palm scanners are installed during the events of this episode.