“The ref made a bad call,” filmmakers tells press backstage.
Presenters included Serena Williams and Julia Roberts.
Olivia Colman:, “If by the way I forget anybody, I’m going to find you later and I’m going to give you all a massive snog.”
Yorgos Lanthimos’ The Favourite and Alfonso Cuarón’s ROMA began night on 10 nominations apiece.
Awards in the four affected categories are back in the ceremony TV broadcast.
Statement follows open letter from nearly 100 filmmakers about decision to present four Oscars during commercial breaks.
Gareth Ellis-Unwin says plan to cut four categories from TV broadcast ”is a damaging move”.
Notables including Alfonso Cuaron, Christopher Nolan and George Clooney add names to open letter.
Alfonso Cuaron, Guillermo del Toro and Jason Reitman among those who have criticised the decision.