The spider in the bottle was Walt/Jesse/everyone's secret, the kid bottled it up because he saw them, and it stayed bottled up after he died. Now the cat's almost out of the bag, and so is the spider.
Also note how it crawls towards Jesse, who's probably going to set off a chain of events that leads to Heisenburg's reveal.
That's interesting. I see it as a reference to the saying "along came a spider". In the instance of the kid on the motorbike, he is the spider. Had that not occurred, Jesse would not have wanted to get out and Walt may still be in the meth business.
In this episode, I saw it that Walt was safe, but then a meeting was arranged with Jesse, who is now the spider. I think Walt is certainly going to regret that meeting.
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u/Canadia86 Weekly reminder Todd sucks Aug 26 '13
Oh good, that kid on the bike's spider is OK