When Carter dials the Stargate to go home, she dials 9 symbols. But that is too many, as 7 is the correct number to dial within this galaxy.
The inhabitants of the planet were taken from Earth through the Antarctic Stargate during the Middle Ages. Daniel estimates that this happened at least 1,000 years earlier. However, when subjecting Teal'c to the trial by water, the Canon recites the Prayer to St. Michael, which was composed by Pope Leo XIII in 1886.