More charitably than Harold, they opine that:

Even though the script was ruthlessly edited by the censorship board, West managed to maintain her signature innuendo.

Similarly, in the Sept. 22, 1934 New York Times, reviewer Andre Sennwald writes:

Although Mae West has graciously permitted the New York censors to make an honest woman of her in her new picture, she has not adopted the emblematic blue-nose [...] it immediately takes its place among the best screen comedies of the year.

The APA Style for movie citation would be:

LeBaron, W. (Producer), & McCarey, L, (Director). (1934). Belle of the Nineties [Motion picture]. United States: Paramount Pictures.

The MLA style would have it:

Belle of the Nineties. Prod. William LeBaron, Dir. Leo McCarey, Perf. Mae West, Roger Pryor. Film. Paramount Pictures, 1934.