The clause in question is this: "… the fact that there are only a couple of women and no lead actors of color may rub some the wrong way."
I'm not sure if bringing this up tells us more about the reviewer or the times we live in. Either way, it's worth remembering that this was 1940, in a Europe rather different from today's. Hard to imagine who a lead actor of color (which sounds off-putting to me) would play. I also guess that but that for shortcoming the film would have been give four stars.