I was beyond happy to see cancelled spelled properly. Apparently the "new" or "American" way is with a single "L."

I detest it. It violates one of the first grammar rules I was taught: When adding "ed" or "ing" to a word ending with a consent, double the consent. 

Also, no one, spells "cancelation," with one "L", (it's cancellation); why would anyone spell "cancelled" or "cancelling" with a single "L?"

(signed,) 

Grammar Nazi