48 Hours

This episode marks the first appearance of Dr. Rodney McKay (David Hewlett) on Stargate SG-1 (1997). He would later become a regular character on the spin-off series Stargate: Atlantis (2004).

Major omission (later rectified) with a series-wide key artifact: one DHD is "lost" in overall series development since Russians now apparently have the only DHD on the planet. It was taken back from Germans after WW2 as mentioned in Watergate (2000). It was therefore the original DHD from the Giza Stargate recovered by the Russians from the bottom of the ocean after the events in Nemesis (2000).

After that, SGC ran the Stargate from Antarctica,discovered in Solitudes (1998). They should still have the corresponding DHD as well since it was obviously taken back from the unofficial NID team in Touchstone (1998), along with the second Stargate. But that DHD is missing from the plot line without any explanations. However, much later (in Frozen (2002)), a posterior explanation is given: this DHD died shortly afterward in Area 51, while it was being studied, since it was apparently the oldest DHD in the galaxy.