The first sentence; I went to with Joey Campbell, who lived next door; is wrong because there is no subject before the name Joey
Dr. Livesey's narration adds a sense of plausibility to all the excitement we've witnessed. All the same, Livesey's observations are rather similar to Jim's so there's no significant break in continuity when he picks up the story.
It means to grasp the conce[t of what you searched yesterday
Ray Bradbury way the first person narrator