Oscar Got It Wrong!: Best Actress 1951

The Contenders:

Katharine Hepburn: The African Queen
Jane Wyman: The Blue Veil
Eleanor Parker: Detective Story
Shelley Winters: A Place in the Sun
Vivien Leigh: A Streetcar Named Desire (winner)

Oscar Got It Wrong!: Best Director 1951

The Contenders:

John Huston: The African Queen
Vincente Minnelli: An American in Paris
William Wyler: Detective Story
George Stevens: A Place in the Sun (winner)
Elia Kazan: A Streetcar Named Desire

Oscar Got It Wrong!: Best Original Screenplay 1951

The Contenders:

Ace in the Hole
An American in Paris (winner)
David and Bathsheba
Go for Broke!
The Well

Oscar Got It Wrong!: Best Actor 1951

The Contenders:

Humphrey Bogart: The African Queen (winner)
Arthur Kennedy: Bright Victory
Fredric March: Death of a Salesman
Montgomery Clift: A Place in the Sun
Marlon Brando: A Streetcar Named Desire

Oscar Got It Wrong!: Best Adapted Screenplay 1951

The Contenders:

The African Queen
Detective Story
A Place in the Sun (winner)
La Ronde
A Streetcar Named Desire

Oscar Got It Wrong!: Best Picture 1951

The Contenders:
An American in Paris (winner)
Decision Before Dawn
A Place in the Sun
Quo Vadis
A Streetcar Named Desire