- Jimmy and his sister Ellie were both bitten/scratched by Joanie, NOT Jake. This attack happened in the first 20 minutes of the movie when Jimmy and Ellie were involved in a car accident with Becky who was Joanie's intended victim.
On that same night, teenager Jimmy Myers is picked up on Hollywood
Blvd by his sister Ellie, who just came back from visiting her
boyfriend Jake Taylor. Jimmy had a run in with some bullies and his
crush Brooke. On their way home, Jimmy and Ellie hit an animal and
another car. They attempt to rescue the other driver, Becky Morton,
but she is suddenly dragged and ripped in half by an unseen creature.
Jimmy and Ellie are both slashed by the creature's claws, but make it
out alive.
In the meantime she figures out that Jake is a werewolf. He confirms
it, but claims it wasn't him that attacked her and Jimmy. Another
werewolf attacks, seemingly proving his story.
- The dog's name is "Zipper" NOT "Skipper".
The only reference to Jake biting or scratching someone and turning them into a werewolf was when he accidentally turned Joanie during a night of rough sex.
Zipper was turned into a werewolf-dog from biting Jimmy.
Remember that after Joanie is killed, Jimmy and Ellie are still infected with the curse. This is because Jake turned Joanie into a werewolf. The original curse has to be lifted, meaning it did not matter if Joanie was killed, if the werewolf that killed Joanie was still alive, the curse is still in effect.
Even though Jake did not directly turn anyone in the movie besides Joanie, he is the main source for the curse.
The curse was not lifted on everyone until Jake died. (including Zipper)