CarrionCrow: Ah....I didn't see that the first time, either. Remember earlier, when she tells her mother that she lost her bracelet, and her mother scolds her to what seems like a bit of an unnecessary degree? Well, it turns out that the bracelet was one of those medical alert types, and if you get the road flares from the carjacker by using the gun you get from the shop owner after you help him with his rat problem by setting the wall on fire with the gasoline you get by paying the homeless guy five dollars to distract the clerk at the station?
You can use the flares to distract the sewer alligator and find the bracelet. (Turns out the clasp broke, it fell down a sewer grate and the kid didn't even notice.)
But anyway. Long story short, the bracelet says that the girl's actually diabetic. I'm not diabetic myself, but I THINK that her eating the ice cream, even though she knew it wasn't good for her, was a commentary on the consequences of attaining power and the overall importance of strength and determination, even in the face of massive temptation and seeming harmlessness.

Stilton: Okay, that makes it clearer. And I suppose it also accounts for the way the woman in the supermarket was giving the Rabbi sidelong glances without wanting to draw attention to the fat man wearing the Disneyland Paris t-shirt who was lurking at the meat counter with a kind of Jack the Ripper look in his eye? Which in itself was a kind of dystopian beginning to act three (the old man dressed in a Spiderman costume clinging to the side of a moving bus with a deeply moving look of regret in his right eye, while his left, which was glass, was staring upward at a disconcerting angle, presumably to engage the viewer's innate sense of the sheer unknowable scale of the cosmos). If that's what you mean, I'm with you.
Right, right. The woman and the rabbi are working together to dismantle the cult that the girl started after the whole 10 year flash-forward thing, and the guy in the Disneyland shirt is the contact they have to convince in order to find out where it's meeting so the woman can get her son back. Course, you and I both know how the whole storyline with that goes vis-a-vis the son, the cult leader, and what the mother has to do when she realizes what must be done.
The mother's speech before she sets in with the power drill?
Well, I'm not ashamed to admit it still brings a tear to my eye.
Also, it might have been a bit on the immediately dark side, but I greatly enjoyed the fact that the old man only had one eye, even if some of the critics didn't get that part and complained in their reviews about it.
Norse mythology so rarely gets a decent representation in media, so seeing that nod to the avatar of Odin, albeit in the body of an elderly man with a penchant for dressing up like superheroes due to his advanced age, was quite interestingly presented.