When Teal'c is shot by O'Neill, he falls back onto the floor surrounded by dead Jaffa. When O'Neill and Carter run up to him after he falls, he is lying on the floor with no one around him.
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 the team heads over to Apophis' ship, the self-destruct sequence can be heard counting down, but, a short time later, as they explore the ship, it is no longer heard.