At:
Bonus points
The localStream object passed to getUserMedia() is in global scope, so you can inspect it from the browser console: open the console, type stream and press Return. (To view the console in Chrome, press Ctrl-Shift-J, or Command-Option-J if you're on a Mac.)

"type stream and press Return"
Shouldn't it be "type localStream and press Return" since the variable name is localStream