Five-year-old leukemia survivor Miles Scott was due to appear with The Amazing Spider-Man star Andrew Garfield at Sunday night’s event, before organisers cut that part at the last minute.
"I don't know if they ran out of time, or if there was something about the segment they didn't like," Miles' mother Natalie told the International Business Times. "It got pulled so quickly that we didn't have a lot of insight into what was going on."
The Academy had teamed up with the Make-a-Wish Foundation to bring Scott to the Oscars. He first became known as Batkid after fulfilling his wish in San Francisco, when some buildings were turned into Gotham City.
Scott accompanied a Batman through the streets to take on villains like Penguin and the Riddler in a stunt so popular that thousands stopped to watch and #batkid trended on Twitter.
Garfield did not attend the ceremony and, instead of his Oscars role, Scott was reportedly offered an all-expenses paid trip to Disneyland.
A night at the Oscars
A night at the Oscars
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Actors front row from left, Jared Leto, Jennifer Lawrence, Meryl Streep, Ellen DeGeneres, Bradley Cooper, Peter Nyongío Jr., and, second row, from left, Channing Tatum, Julia Roberts, Kevin Spacey, Brad Pitt, Lupita Nyongío and Angelina Jolie as they pose for a "selfie"
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Benedict Cumberbatch jumps behind U2
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Host Ellen DeGeneres (R) with pizza delivery man in the audience during the Oscars at the Dolby Theatre
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Jennifer Lawrence reaches out to grab a friend as she falls on the Oscars red carpet
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Singer Liza Minelli arrives for the 86th annual Academy Awards ceremony at the Dolby Theatre in Hollywood, California
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Bette Midler performs "Wind Beneath My Wings"
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Actor Jared Leto, winner of the Best Performance by an Actor in a Supporting Role award for 'Dallas Buyers Club'
"Basically, because of the fluid nature of live TV production, ultimately the segment didn't work," an Academy spokesperson told Entertainmentwise.
Josh deBerge from the Make-a-Wish Foundation added: "Make-a-Wish was not involved in any way with the decision about what did not or what did make it in on-air that evening."