Adding to the conversation thing:
You can also see when it clicks to Skyler what's going on and she starts being submissive to Walt, letting him drone on and on. She even asks him directly about Hank even though she already knows the answer.
Also, Walt breaking the phone at the end is a good indicator that he knows the cops are there--another thing I didn't put together during the first viewing.
Other interesting tidbit was Hank being buried in the hole where the money used to be, meaning Walt literally dug Hank's grave.
This show. This show is the best show. This episode is
literally
rated 10/10 right now
on imdb.