How does that work? Was Sunday's episode's timeline earlier than the "Rick under the bed" episode?
The timelines have not been chronological for the various character situations. We saw the dead bunnies BEFORE we saw Lizzie kill them. We saw the remains of the track-side zombie fest BEFORE we saw Beth and Daryl stumble on it. It's an interesting puzzle for viewers to piece together.
I enjoy rewatching previous seasons during AMC's marathons. It's interesting to see how many clues the writers give us as to what will happen next. Now I know to look for them - part of the fun of watching!