New Yorker article on Ivy League college admissions. And if you have no time to read the entire thing, you should at least see this quote from Jerome Karabel's book describing Yale admissions in the 50s:

The admissions committee viewed evidence of “manliness” with particular enthusiasm. One boy gained admission despite an academic prediction of 70 because “there was apparently something manly and distinctive about him that had won over both his alumni and staff interviewers.” Another candidate, admitted despite his schoolwork being “mediocre in comparison with many others,” was accepted over an applicant with a much better record and higher exam scores because, as Howe put it, “we just thought he was more of a guy.” So preoccupied was Yale with the appearance of its students that the form used by alumni interviewers actually had a physical characteristics checklist through 1965. Each year, Yale carefully measured the height of entering freshmen, noting with pride the proportion of the class at six feet or more.

and later in the article:

And the most important category? That mysterious index of “personal” qualities. According to Harvard’s own analysis, the personal rating was a better predictor of admission than the academic rating. Those with a rank of 4 or worse on the personal scale had, in the nineteen-sixties, a rejection rate of ninety-eight per cent. Those with a personal rating of 1 had a rejection rate of 2.5 per cent. When the Office of Civil Rights at the federal education department investigated Harvard in the nineteen-eighties, they found handwritten notes scribbled in the margins of various candidates’ files. “This young woman could be one of the brightest applicants in the pool but there are several references to shyness,” read one. Another comment reads, “Seems a tad frothy.” One application—and at this point you can almost hear it going to the bottom of the pile—was notated, “Short with big ears.”