Cite used:
http://http://www.sportsnet.ca/hockey/nhl/how-geometry-created-the-illusion-of-a-flames-goal/
I came upon this video when researching a controversial play. In the video it talked about how the parollex view affected the call of the play. This angle applied for when the puck crosses the goal line and when referee make calls based on their view of the play. This to me is extremely interesting although not to informative it is extremely interesting how math can affect calls so easily.