This video is geared towards believers. Unbelievers can (and do) do anything they want. There are no rules. As a believer, can anyone name something Godly about halloween?
Or Valentine's Day, or Ground Hog Day, or a birthday, or President's Day. What is the problem that a Christian would have unless you're into witchcraft or Satan worship? For the record, I do not participate in Halloween.
Patriotism (and religion) is the last refuge of a scoundrel.