The flag poll glitch (not the one where you jump over the flag poll) in SMB is used to shave a few seconds off of your time in every course. Now people are using this glitch to constantly claim the mantle of World Record holders..
Although the game has had many speed runners beating it, there always seems to be a new world record holder every once in a while, this seems to be because of the Flag Poll Glitch. On October 6th of this year (2016) we have a new World Record holder, Darbian. At 4 Minutes and 56 seconds. The previous record was 4 Minutes and 57 seconds according to Kotaku.