Suibhne - the colours in that film almost hurt the eye... love the music. Re the custom of revealing the pip star and carving names of 2 loves -
I grew up with a wholly different apple custom. Grasp the apple in one hand and stem in the other, and recite the alphabet, one letter for each twist of the stem. The letter that the stem came away on was the first letter of your true love's Christian name.

I am trying to find something about the custom of placing and apple in the boar's mouth. So far only questionable wikipedia entry:

According to folklorists the boar's head tradition was:
"initiated in all probability on the Isle of Britain by the Anglo-Saxons, although our knowledge of it comes substantially from medieval times....[In ancient Norse tradition] sacrifice carried the intent of imploring Freyr to show favor to the new year. The boar's head with apple in mouth was carried into the banquet hall on a gold or silver dish to the sounds of trumpets and the songs of minstrels." [2]
In Scandinavia and England, Saint Stephen may have inherited some of Freyr's legacy. His feast day is December 26 and thus he came to play a part in the Yuletide celebrations which were previously associated with Freyr (or Ingwi to the Anglo-Saxons). In old Swedish art, Stephen is shown as tending to horses and bringing a boar's head to a Yuletide banquet.[3] Both elements are extracanonical and may be pagan survivals. Christmas ham is an old tradition in Sweden and may have originated as a winter solstice boar sacrifice to Freyr.

And another wiki entry on bobbing, dooking and snap apple:

Apple bobbing originates from Celtic times when Halloween was called Samhain in some Gaelic languages, when apples were associated with love or fertility. Some say this comes from the Roman goddess Pomona whilst others note that this game is an important part of the Celtic pagan religious festival of Samhain when families would gather together for a communal feast.

The current game is based on a New Year tradition, where whoever bites the apple first in the group will be the first to marry. The similar tradition of throwing rice at a wedding evolved from this, except apples were thrown originally. However, the popularity of throwing other types of fruits such as peaches and pears is making a comeback.

Strange throwing fresh fruit at the married couple, but then I guess it is better than throwing tinned (canned) fruit at them.