Jenna Bush and Michael Keaton (my Bruce Wayne; my Riggan Thomson; how could you??) made the first and most public versions of the error, but far from the only versions of it.
As to why it really is a comparatively big deal - and not the teeny little deal The Usual (teeth-sucking, hyper-rationalizing) Suspects are (still) trying to minimize the (repeated) error into, all I have to say is
“Especially if you work in the industry – how much of a STAHP Face do you give somebody who comes up to you and tells you what great work you did in ‘Rogue La La’, or if you catch them telling Cher how much they loved her in ‘Moonlight’?”
Pharrell, Janelle, Taraji, and Miss Octavia were most generous, bounteous, and gracious in their forgiveness, too, before anybody (especially any WYPIPO, which – I feel like I just might have to adopt because Too Hilarious, I am sorry) gets their knickers in any kind of twist:
Pharrell’s face tho
Some of these made me scream.
Pharell gets the last word, too