Now this is the kind of stuff I like to see. Teal'c, while he is a 'good guy' now, is still technically a hardened war criminal, having committed many atrocities in the name of his former master Apophis. In this episode he is held accountable for one of these war crimes by the son of a victim, and put into 'cor-ai', which is their form of trial - the sentence being death.
Initially, Jack, Sam and Daniel try to argue Teal'c's case by finding out why he did it (to try and save as many of the other villagers as possible), but then - and this is something that still doesn't sit right with me - Jack decides to go back to Earth to bring reinforcements back to forcibly break Teal'c out. Teal'c objects to this, as do Sam and Daniel at first, but then those two change their minds and want to break Teal'c out too. Fortunately, general Hammond has his head still firmly screwed on and refuses to go through with this. It really bugs me that Jack would go to this length to free Teal'c - even after Teal'c has told him that he won't go in this manner. I certainly wouldn't like to see Teal'c die, but I definitely don't want to see the villagers' lives, and those of the SGC reinforcements, put at risk in order to free him from what is after all a legitimate justice system.
In a couple of O'Neill's scenes we see references to things he may have been ordered to do by the US government. This has never really been touched on before, but it paves the way for future episodes that will confirm he was involved in what are known as 'black ops' - highly clandestine military operations which may go against the military's code of conduct or even against laws. He mentions to general Hammond that he has been ordered to do some "damn distasteful things" in his years of service, and his eagerness to break Teal'c out suggests that maybe Jack's not ready to face the consequences of what he's done, or is still in conflict with his conscience. It's something that gets a little more development in the future, but not much that I can recall.
You just know he loved shouting OBJECTION! during the cor-ai though!