Originally, the Imagine Spot of the Girl bathing went on to show the plumber dropping his wrench into the tub. As he reaches into the suds for it, the Girl seems blissfully undisturbed about him invading her space.
This dialogue the Girl delivers to Richard after having her skirt blown by the subway also never made it to theaters:
The Girl: This one's even cooler! Must be an express. Don't you wish you had a skirt? I feel so sorry for you in those hot pants.
A scene written, but probably never filmed, involved Richard's housekeeper finding a hairpin on his pillow, implying that he and the Girl slept together.
Executive Meddling: The act of adultery (consummated in the play) was removed by the censors, as were a few profanities and a few other bits considered risqué in 1955.
Fake Nationality: There's a whole tribe of fake Manhattan Indians at the beginning (as a narrator explains the anthropological origins of adultery).
The Pete Best: Vanessa Brown played The Girl in the stage version alongside Ewell, but was apparently not asked to reprise the role for the movie. (Then again, Ewell was almost not asked to reprise his role; see What Could Have Been below.)