This is the first episode of the series to feature an alternate reality.
The opening and closing scenes were shot at a high voltage resonance test set owned by the Powertech company near Vancouver.
When Col. O'Neill says "Good Morning, Campers" this is the first of many times he will call people, "campers."
The second and third shots of Michael Shanks as 'Daniel Jackson' shown in the opening credits (one where he runs into a scene that has the Stargate in the background with a closed iris, and the other a closeup taken from a low angle as he studies something out of view) are both taken from this episode.