Another edit for another sensible review. Oy...Tiger, you fangirl.
"Something Significant" has got to be one of my favorite episodes, and not just because my boy's in it.
It really does carry its own weight as an episode. It reveals a lot about both history and Trent's character, and is quite strong for that. In the sense of small things becoming big, it's a lot like "A Glass Darkly"--you can't always see the end result of certain things, and maybe you never will, but nothing done for God is too small to become significant.
I have a headcanon about the end--Trent talks about how he knows the song "Jesus Loves Me" when he sees it written for Susan Warner's
Say and Seal, then at the end, he sees Anna Warner, Amy Carmichael, the rescued slave girls, and a group of young children singing the song. My headcanon is that the group of children singing it is Trent and some other kids learning the song when they were very young; he sees not only the historical impact of the song, but the impact of the song on his own life. (It defies what we know about the Imagination Station's programming, but it's my headcanon, so deal with it.)