Short answers, pulled from the story.
Annie Hall won four Academy Awards at the 50th Academy Awards on the 3rd of April 1978: Best Picture (Charles H. Joffe), Best Director (Woody Allen), Best Original Screenplay (Woody Allen and Marshall Brickman), and Best Actress (Diane Keaton). Woody Allen was also nominated for Best Actor, giving the film a full sweep of the Big Five nominations.
The screenplay for Annie Hall was written by Woody Allen and Marshall Brickman. Allen wrote a first draft within four days, and the two writers sent the script back and forth through multiple revisions before requesting $4 million from United Artists. The screenplay later topped the Writers Guild of America's list of the 101 funniest screenplays ever written.
Annie Hall was officially released in the United States on the 20th of April 1977, after an earlier screening at the Los Angeles Film Festival on the 27th of March 1977. It earned $38,251,425 in the United States and Canada against a $4 million budget, making it the eleventh highest-grossing film of 1977. It also grossed over $5.6 million in the United Kingdom.
Woody Allen has consistently denied that Annie Hall is autobiographical, stating that autobiographical elements people identify are "almost invariably not" accurate and are "so exaggerated as to be virtually meaningless." However, Diane Keaton's real surname is Hall and her childhood nickname was Annie, and Keaton has said the relationship between Alvy and Annie was partly based on her real relationship with Allen.
The original concept for Annie Hall was a murder mystery drama with a romantic and comic subplot. Allen proposed the title Anhedonia, a clinical term for the inability to experience pleasure, while Brickman suggested alternatives including It Had to Be Jew and Rollercoaster Named Desire. After testing titles including Anxiety and Annie and Alvy, Allen settled on Annie Hall.
Annie Hall's costume style, developed by designer Ruth Morley in collaboration with Diane Keaton, popularized a look built on oversized menswear for women: mannish blazers layered over vests, billowy trousers or long skirts, a man's tie, and boots. The style became known as the "Annie Hall look" and was widely adopted in the late 1970s. Ralph Lauren has claimed credit, though only one jacket and one tie in the film were purchased from Lauren.