Best Actor
Lionel Barrymore:
A Free Soul
Best Actress
Marie Dressler:
Min & Bill
The first of the famous acting family to earn an Academy Award, Barrymore was also directing feature films at this time. The plump, older actress was very popular, and Min and Bill was a smash hit.
Nominee:
Jackie Cooper: 
Skippy
Nominee:
Marlene Dietrich:  
Morocco
The first child star to make the list of nominees, and the only one to ever get one in the Acting category. Dietrich was a smash in her first Hollywood film.  While she had a big career ahead of her, this would be her only nomination.
Nominee:
Richard Dix: 
 
Cimarron
Nominee:
Irene Dunne: Cimarron
His performance in the Best Picture winner, Cimarron, earned him his only Best Actor nomination.  Dunne had a huge career ahead of her, but her breakout role was as the dutiful wife in the Best Picture winner, Cimarron.
Nominee:
Frederic March:  The Royal Family of Broadway
Nominee:
Ann Harding:  Holiday
March's first nomination came for his send up of the legendary John Barrymore.   One of many Broadway stars wooed by Hollywood when talking pictures took hold, Harding was nominated for her role in a movie that would later be remade with Katherine Hepburn and Cary Grant.
Nominee:
Adolphe Menjou: The Front Page
Nominee:
Norma Shearer:  A Free Soul
Menjou had a huge career in silent films, playing dapper gentlemen, but his career faltered when sound was ushered in, in part because of his progressing age, (he was relegated to supporting characters), and in part because of the image that his voice lent his persona. Certainly a pre-code film, Norma earned her second nomination, playing a high society gal, who is only interested in gangster Clark Gable, for sex.