The Christmas Truce was portrayed in the movie "Oh What A Lovely War". The movie was a rather facetious semi-musical, but the Truce scenes were much like those described here. One of my favorite lines was from a kilted Scot who said something like "We dinna start this, THEY did" (pointing to the nearby English).
My favorite story about a so called truce was when a French pilot shot down a German over France. He landed next to the German who was not injured and captured him and decided to take him to a local bar. When the French police showed up to haul the German off, the French pilot gave him his pistol back. They ran the police off and went back to drinking.
When I lived in Savannah, GA I had a guy who worked on the engine of my sailboat who was a WWII fighter pilot who was shot down over Italy. He was captured and put in a POW compound. He said the German who shot him down would come and see him, have him swear he would not try to escape and take him into the local town. He said this went on for a while until the German pilot didn't come back anymore. He said he has always wondered what happened to him.