* 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).
* [[HeyItsThatGuy Hey, It's That Act!]]: Quite a few acts appeared previously on other talent shows, including:
** Kelli Glover from ''Series/AmericanIdol''
** Alice Tan Ridley, At Last, and Sideswipe, among others, from the short-lived FOX series ''30 Seconds to Fame''.
** Strikers All-Stars, Ring Masters, and Status Quo (as SQ Entertainment) from ''America's Best Dance Crew''
** Also works in the reverse with AGT acts appearing on other shows -- most notably Jabbawockeez on ''America's Best Dance Crew''. One of the guys from Sideswipe also later landed a starring role in ''Series/KamenRiderDragonKnight''.
** Professor Splash appeared in one of the clips on an episode of ''[[Series/TheSmokingGunPresentsWorldsDumbest The Smoking Gun Presents World's Dumbest Daredevils]]'' and Busty Heart appeared on Would's Dumbest Performers.
*** Busty Heart had previously appeared on The Man Show, years before.
** Piff the Magic Dragon had previously appeared on ''Creator/PennAndTeller: Fool Us'', and can also be spotted on the cover of Mumford & Sons' album "Babel."
** Steve Starr, aka The Professional Regurgitator had appeared on Series/BritainsGotTalent in 2010.
* RealLifeRelative: Nick Cannon's now ex-wife Music/MariahCarey did a guest performance during Season 4's finals.