I noticed a couple of things about the Hatch sequence at the beginning. Sorry if someone has already mentioned this.
First, at the end of last season when Juliet fell and the bomb fell, they both went a LONG ways down. They had been drilling pretty darn deep. But in the premier when they found Juliet, she wasn't that far down. Just a few feet or so.
Also, when they were moving stuff out of the way to get to Juliet, they moved an exercise bike and a chair. Both of which were INSIDE the Hatch at one point. I don't remember seeing either of those things at the construction site, and why would the bike be there in the first place?
It makes me think that something different happened at that point. But what?