Agreed. A walker saying a line opens too many questions about their brain activity and the science was already explained in season 1. Plus Shane saying "Riiiiick" sounds incredibly tacky even for a cartoon let alone a real action tv show.
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I think Morgans wife having memories is a stretch. She died in the area and was just randomly roaming around. They let her touch the doorknob and chill on the porch to make for a more emotional scene. And I'd say it worked because Morgan became a fan favorite with one episode with all that emotional conflict. Shit was real straight away. I miss season 1 :/