You can't blame this one on Warren Beatty.
But that wasn't the only mishap the night!
An Australian film producer was featured in the show's In Memoriam segment, despite the fact that she's not actually dead!
A photo of Jan Chapman (above), who is alive and well, was used in place of Janet Patterson, an Australian costume designer who died in October 2016.
The four-time Academy Award nominee was best known for her work on films like Peter Pan and The Piano.
Viewers were quick to notice the mistake, as Chapman is one of Australia's best known producers and still active in the industry.
Needless to say, Chapman — who worked on The Piano with the deceased Patterson — was not happy about the error, telling Variety: