LOL I know! XD I was sitting there wondering why Helen's mom would just sit there while a random boy in the city came up to her in the dark. Sure Will is young but you can't be too careful these days. Especially at night.
That confused me too. I suppose he just buzzed off trying to hold back his tears. I'll bet he was really confused with his sudden non-existence after Wizeman was defeated.
Reala: *after drying off his tears, begins to disintegrate* Do I suck that bad?!
As for the actual ending itself, I'm positive people here have it right and it's entirely symbolic. The lights turning out is really the only other thing that's a tad confusing about it. Not sure if that was symbolic of Wizeman and his creations' return, or what. It could have just been to scare Helen so Will could make a snazzy entrance and get the girl. The parents sure did run off awful quickly.
Helen's mom didn't even react to her daughter getting scared. Will's dad (and friends)...well I guess just kept walking. That's love right there, leaving your son alone in a city at night.
And I too couldn't figure out why Will's dad didn't notice his son missing. Must have gotten a call on his cell or somthing....