The Twilight Saga: Eclipse (2010) - 4 questions

Question: This question pertains to New Moon and Eclipse: When Billy is telling the story of the Quileutes and the "cold ones", he says the cold ones can only be destroyed completely by fire. We've seen James and Victoria be destroyed that way, but Laurent and Riley were killed by the wolves. Was fire not necessary in their deaths (there was no evidence that the female vampire in the story was further destroyed by fire) or is it really not the only way vampires can be destroyed completely (according to Stephaine Meyer at least)? It seems unlikely Jacob and the rest of the pack would have matches or lighters with their clothes every time they remembered not to phase with them on.

Answer: In the books, fire is the only way and the parts of the vampires are gathered together after the battles and burned. In the films, a mere beheading seems to do the trick, so while Billy's story in the film stays faithful to the books, in actual practice the films do not.

Question: Okay, so if all the male werewolves wear nothing but shorts so they have less clothes to destroy, how come Leah still wears a shirt? It just seems that as a werewolf, she wouldn't care about nudity any more then her packmates. And, yes, I am aware they couldn't show her naked for the PG-13 rating. I'm looking for the in-universe answer.

Answer: How do you know that she or anyone else "wouldn't care." Leah is the lone female shape-shifter among the males, and most women would feel extremely uncomfortable baring their breasts in that situation. Her male counter-parts would likely feel just as exposed and uncomfortable if they went without shorts in front of a group of women. It's a matter of decorum.

Question: How can Riley be missing for a year as well as be a 1 year old vampire if he was made and last seen in May 21 2010 (according to the flyer Charles has)? The opening of the movie, where Riley is attacked, make it seem as though it all "just happened." And with the timing of Bella's journey (she arrives in Forks in March, prom is in late May or early June (most proms are end of the school year), her birthday is in Sept, she begins her time with Jacob in Feb, Edward comes home in April (guessing), she graduates in June 2010. So James was killed in May (before prom). I get Victoria could have made Riley in May just after James was killed BUT then the "last seen" date on the flyer shouldn't be so recent. Did I miss something?

Answer: The date on it is a mistake. Some claim he could've been seen after he officially went missing, so the mistake is not allowed on this site. However, the description of his "last seen" appearance is clearing the opening sequence, which would've happened a year prior to the current events. By the movie's timeline, Victoria would've created him in May 2009 after James was killed, and this is now a year later.

Question: In the scene where the Cullens are filling Jacob and his friends in about the newborn vampire army, this is all taking place during Bella's graduation party. Why would they discuss it there where other people could hear them or notice them? In the book they discussed it later that night after the party.

Answer: They combined the scenes to save time. Also, all the characters involved have super-sensitive hearing, so they could easily lower their voices enough not to be overheard while still being able to hear each other perfectly well.