First mention and appearance of a Naquadah Reactor. These are developed and improved upon throughout the series.
The teacher, Mrs. Struble, asks how Cassandra is enjoying Junior High. She's referring to the girl whom the team brought back from Hanka in Singularity (1997), and whom Dr. Frasier adopted.
Although it turned out all right in the end, "Learning Curve" is a prime example why the "Prime Directive" was developed in Star Trek. Stargate has several examples of interference with a planet's culture.
First episode in the series for Heather E. Ash as a writer (out of 5 episodes total, seasons 3-5) and a story editor (out of 18 episodes total, all on season 3).