The Earth point of origin, which is supposed to be unique to the Stargate found in Giza, is clearly visible on the Dakara Stargate.
When Mitchell is about to speak with the Prometheus, the countdown clock behind him counts from 1:12 to 1:11. Mitchell then looks off camera before a subsequent close-up in which the clock ticks down past 1:26.
When Dr. Daniel Jackson is talking with Major General Henry Landry about the businessmen who make up The Trust, they enter an elevator, which goes from level 3 to level 28 in approximately 6 seconds.
The sub-headline in the local Richmond (VA) newspaper reads "Massive layoffs bring Edison, VA to it's knees". The proper spelling for the possessive of "it" is "its", with no apostrophe. "It's" is a contraction of "it is".
When briefing Col. Pendergast on the Prometheus in the search for Gerak's mothership, Teal'c states that vessels the size of a Hatak mothership have no cloaking capabilities. However, Hatak class vessels have been seen cloaking and decloaking multiple times throughout the series.
When Sam looks up Farrow-Marshall on the internet, she says that their "Chief Financial Officer" went missing yesterday. The article on the screen, however, lists him only as "Vice President" and mentions nothing of him being CFO.