If you thought the “Moonlight”/”La La Land” envelope fiasco was the Oscars’ only glaring mistake, think again.

The “In Memoriam” segment of Sunday’s show included a tribute to costume designer and four-time nominee Janet Patterson — but ran a photo of the very-much-still-alive Australian producer Jan Chapman by mistake.

The two women worked together on Jane Campion’s 1994 film “The Piano,” for which they both received Oscar nominations, and Chapman’s image does appear in some photo databases under Patterson’s name.

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But Chapman is very much alive, and has worked on such recent movies as “The Babadook” and “The Daughter” with Geoffrey Rush. Patterson passed away last October 21 at age 60.

In addition to her costume designs for “The Piano,” Patterson was also nominated for 1996’s “The Portrait of a Lady,” 1998’s “Oscar and Lucinda” and 2010’s “Bright Star.”