The racing episode at least was fast-paced, it was a sorely needed change of pace to make Tech the protagonist, and nicely set up some possible outcomes for the season, so it ranks fairly highly for a self-contained episode. The last one instead felt like a retread of the first treasure arc, they even end the same way, with the Batch leaving empty-handed, but without significant character development or thought-inducing conflicts this time around. A random, fun adventure, but nothing more.