* ExecutiveMeddling: A couple times, when the judges believed an act made a bad song choice, the performers mention that producers influenced that decision (Arcadian Broad in Season 4 with a ''HighSchoolMusical'' number, the Fiddleheads doing "[[Music/MichaelJackson Billie Jean]]" in Season 6).
* FollowTheLeader:
** Since the success of Fighting Gravity in Season 5, every year has seen at least one notable group that uses similar light-on-a-darkened-stage effects (Team [=iLuminate=] in Season 6, two or three in Season 7 but Lightwire Theater is the most similar).
** After the success of Kenichi Ebina in Season 8, there have been several more acts that do a similar miming/dancing to video thing.
* RealLifeRelative: Nick Cannon's now ex-wife Music/MariahCarey did a guest performance during Season 4's finals.
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