Kerr's review:
http://www.nytimes.com/mem/theater/treview.html?pagewanted=print&res=FC77E7DF1731E162BC4951DFB767838D679EDE&_r=0 "Cabaret is a stunning musical with one wild wrong note.
...
"We are left now with the evening's single, and all too obvious, mistake. One of the cabaret tables is empty, the table reserved for heroine Sally Bowles. Sally Bowles, as the narrative has it, is a fey, fetching, far-out lassie with a head full of driftwood and a heart she'd rather break than shackle. She is a temperament, and she needs a temperament to play her.
"Producer-director Harold Prince, in a totally uncharacteristic lapse of judgment, has miscast a pretty but essentially flavorless ingenue, Jill Haworth, in the role. Miss Haworth has certain skills and may be able to use them in other ways. Wrapped like a snowball in white fur and sporting that pancake tam that girls of the twenties used to wear whenever they were going to be photographed having snowball fights, she succeeds-at some angles-in looking astonishingly like Clara Bow. But her usefulness to this particular project ends there. She is trim but neutral, a profile rather than a person, and given the difficult things Cabaret is trying to do, she is a damaging presence, worth no more to the show than her weight in mascara.
"The damage is deeply serious and must be stressed."