I like how they are turning Rick and his crew in to the bad guys, that line about taking the place if they have to was great
True, but the line from the episode before where Rick states "We are the walking dead" was mangled and ruined beyond repair. In the graphic novels, that line was the culmination of everything up to that point and where the story title originated and was first spoken. It was the first time Rick had acknowledged that their prospects of survival were looking bleak.
But that girl that doesn't talk is creepy as hell. Someone that young just showed up eight months before... she is obviously very much at home in the woods as she easily evaded Carl and disappeared without a trace. Without saying too much I have an idea what her role is in the show. She wasn't in the books, but sometimes they do/add things and elements that actually enhance the story.
You can tell Rick is pissed because someone knew he stashed that handgun in the blender in the woods and took it. He knows they are being watched more closely than he first suspected.