When Selmak leaves Saroosh, it looks like a larva. As shown in "Children of the Gods," mature symbiotes are dark in color and have a large fin on their back.
Carter, Jacob, and Martouf are the last people to escape from the tunnels via the transport rings. However, when they are transported to the surface the rings evaporated rather than going back into the ground.
In "The Enemy Within" from Season 1, it is said that once a Goa'uld has blended with a host, it is capable of killing them. Garshaw ordered the Tok'ra to remove Kordesh without hurting the host and put him into one of the vanishing tunnels. Surely, he would simply kill his host in order to hurt the Tok'ra further rather than quietly die.
At the end of the episode, the Goa'uld spy Kordesh has jumped into a female host. However, this should be impossible since this woman was seen as a member of the Tok'ra council and would, therefore, already have a symbiote within her. And she must have a symbiote, because if she didn't then she could have been a new host for Selmak.
SG-1 was wearing OD green uniforms to the Tok'ra planet but it was clearly a desert planet so they should have been wearing the desert camouflage.
Jack: Well General, if these were your every day, run of the mill greasy-assed Goa'uld, they would have made us their host already.
Garshaw: Do you not have a dialing device here?
Jack: Yeah, we... slapped a little one together.
Teal'c: Is this another one of your strange jokes, O'Neill?
(team is looking at Tok'ra technology)
Daniel: Direct translation: very cool.
Jacob Carter: What? The Pentagon wants me to deliver a message to God?
Hammond: Not exactly.
Jacob Carter: Well, I don't plan on seeing the other guy.
Syndication air date: January 10, 2000.