How did ILM create the hyperspace tunnel effect?
Although it looks like a slit-scan effect similar to the Tom Baker era Dr. Who titles, in this case, the effect was very simply made with mylar - a reflective plastic.  Due to time and budget constraints, there wasn't much they could do, so they made a tunnel out of mylar and flew the camera through it.  They apparently had a lot of mylar left from making the reflective background behind the starfield.