The Changeling ("the firefighter one") explores Teal'c's subconscious and offers some in depth insight to the character. And since it's the episode where Teal'c and Bra'tac go on tretonin, it's pretty important to the arc of the series. To say this has no relevance to the series is like saying Far Beyond the Stars has no relevance to DS9.
And yes, it is a well known fact that when O'Neill was promoted to general, RDA had his mind on things other than the show.