Thank you very much! It was very helpful. With practice, I’m starting to understand fast speech better.
Sometimes, though, I do understand the words, but not the scene. For instance, in that episode, Dr. Watson says to the anarchist that he must stop his illegal activity. Left alone (18:07), the anachist says, “What? No more bombs? What am I to make, then? Paper bags filled with air, maybe?” Suddenly, he gets some brilliant idea. “Paper bags!” he repeats enthusiastically and returns to his work. This moment is emphasized by music, so it should mean something — some reference, a joke, an Eastern egg (it has nothing to do with the plot). Unfortunately, I didn’t understand that scene.