The sound made when the judges "check" an act was originally the sound used when spins are passed on "Press Your Luck". The sound made when the judges "X" an act is the strike sound used in "Family Feud".
For the seventh season, production of the live show moved from Los Angeles to Newark, New Jersey in order to accommodate new judge Howard Stern whose radio show is based in nearby New York City. For the eighth season, production for the live show was moved to Radio City Music Hall in New York City.
Right before Piers Morgan left and Howard Stern joined, Stern was interviewed by Morgan on his talk-show, "Piers Morgan Tonight". Stern had personally told Morgan that he actually enjoys him as a judge.
Terry Fator, of season two, is the male contestant to win the competition. Not only that, he is the first non-singing act to win. Olate Dogs, Kenichi Ebina, and Mat Franco were the next three non-singing acts to win through seasons seven to nine.
The shape of the X each judge has to use has had four different designs. In seasons one and two, the X was digital and the person's name would be in blue if they buzzed an act. In season three, the X exactly matched the design "Britain's Got Talent" uses. For the beginning of the live shows for the seventh season, the X's edges were sharper. In the next season, the name of the judge would have a white background, instead of blue, the past four seasons, around their name.
The youngest winner was Bianca Ryan, at age 11, in season 1 as of December 2016. Grace Vanderwaal is the 2nd youngest at age 12, winning season 11 nearly 10 years later. They are both the only female winners currently.