In the end, we find out Tyler was the Hyde, learn that Thornhill was controlling him, and finally see Crackstone destroyed. Also, Wednesday learns the importance of hugging and opening yourself up to other people. She even accepts a dreaded cell phone to stay in touch with everyone. It seems like everything is wrapped up nice and neat — until the final scene.
As paramedics transport Tyler to the hospital, he begins transforming into Hyde form, suggesting that we haven't seen the end of him. Additionally, there is still the question of Wednesday's stalker. When examining a music box found in Laurel Gates' room, she finds a secret compartment with photos of herself. Clearly, someone has been following her and taking snapshots.
The easy assumption is that it was Miss Thornhill. As such, her death should mean nobody is stalking Wednesday anymore. However, if that is the case, why does Wednesday gets text messages from an unknown number on her new phone from a number she doesn't recognize? Beyond that, why do those messages contain new photos of Wednesday? That's the problem when your bias gets in the way — it makes you think the world is simpler than it is. However, nothing is ever that simple and there will always be more mysteries to solve.