The Question and Answer section for Dr. Jekyll and Mr. Hyde is a great resource to ask questions, find answers, and discuss the novel.
Dr. Lanyon disagreed with some of Jekyll's scientific ideas, and their friendship suffered as a result.
Jekyll stomped on the key because he had decided to never become Hyde again.
No, Jekyll blamed it all on another person. He felt Hyde was a separate entity:
"It was Hyde, after all, and Hyde alone, that was guilty. Jekyll was no worse; he woke again to his good qualities seemingly unimpaired; he would even make haste,...