1. Goal-Line Technology is being used by the World Cup referees for the very first time. 14 cameras are positioned around the goal.  They're connected to a computer which confirms if a goal has been scored. If it has, the referee feels a vibration in a specially-made watch that he's using and the display will say… Goal!
  2. The referees are using vanishing spray paint on the pitches to mark the spot for a free kick.  The paint disappears after 60 seconds.
  3. Football referees in Scotland are not, for the purposes of the Employment Rights Act 1996, employees of the Scottish Football Association.  Lady Stacey's EAT decision provides a great insight into a referee's work (as well as providing an analysis of employment status...) 

Read it here.