Between the episodes Stargate SG-1: Small Victories and Stargate SG-1: Redemption: Part 2, the Beta (Antarctic) stargate is used at the SGC for gate travel, since the original gate ended up at the bottom of the Pacific Ocean in "Small Victories" and later fell into the possession of the Russians until its return to the SGC in "Redemption Pt 2". We notice that in Stargate SG-1: Solitudes (the first episode to feature the Beta gate) the point of origin symbol (an octagon with a line below it) is different from the point of origin symbol of the original gate (pyramid and circle), however in various episodes that featured the Beta gate in use, the point of origin symbol mysteriously changes to the symbol from the original gate.
The characters of Kasuf, Skaara and Sha'Re (originally from Stargate, the movie this series is based off of) appear through the series in various episodes. In the movie, all three characters spoke virtually no English whatsoever, however in the TV series (in which the First Season is set one year after the movie) all three speak perfect English. It is possible that Daniel Jackson taught them English during the year-long span between movie and TV series, but it is highly unlikely they learned it so well in such a short span of time.