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.
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.
Although the SGC has been using the Beta Stargate discovered in Antarctica since Small Victories (2000), the point of origin of the Alpha Stargate is clearly visible as opposed to the point of origin of the Beta Stargate that was previously seen in Solitudes (1998).
When Jack and Maybourne were looking up the N.I.D. flight data on Simmons, the PC screen shows WA DC TO NORTH DAKOTA at the top, but then on the following leg it shows NORTH DAKOTA TO COLORADO. In the itinerary, the first part gives the DEST as MAFB which is correct for Minot AFB, but then on the following leg it again shows DEST as MAFB when it should be PAFB for Peterson AFB.
While in Maybourne's motel room the placard inside the door had the name "Accent Inns". There are no Accent Inns located in Colorado. Accent Inns are a Canadian chain, many of which are located in Vancouver, BC.
In the cafeteria scene, Rodney first reveals his "deathly" allergy to citrus. Yet, as Sam is leaving, you can see he has cheesecake on his tray. Most cheesecake recipes contain lemon (juice or zest) or some form of citrus.