Board Thread:Tapped Out Help/@comment-173.74.131.179-20131017153719/@comment-10811288-20131017172058

The Graveyard and Gingerbread house are available right now! Go get 'em if you want 'em.

As for past items, they'll only be available if EA decides to offer them during the next holiday. This is the first repeat holiday, so I can only speculate, but it looks like there's a chance that anything that isn't tied to an episode release (Like Aztec Homer from last year's Halloween, which is the only Halloween item not currently available) MIGHT be available for donuts on future holidays.

There are people who have offered to hack the content into your games in exchange for money, but there are also EA safeguards that may or may not end up suspending accounts that used said hack, so it's best to stay legit.