Bo reads that during WWI French and German Fae soldiers put down their weapons to celebrate La Shoshain together. Real world, Dec. 1914, the first winter of WWI, during the two weeks before Christmas there were numerous impromptu cease fires set up by the troops in the trenches. They exchanged gifts, shared food, played football (European Football). After that first Christmas the truce broke, trench soldiers went back to killing each other and there were no spontaneous truces for the rest of the war.
When Kenzi texts Bo saying that she and Shawn had gone back home, you can see on Bo's iPhone a button on the screen that says 'Lost Girl Photos'.
At the beginning of the episode you can see a replica of Aragorn's sword from The Lord of the Rings leaning against a wall.
"I thought you couldn't use electricity on La Shoshain." "Wrong culture." In orthodox Judaism you can not start a fire on holy days and turning on an electric device is considered the same as starting a fire. You can keep a fire going through the holy day, you just can not start one.