I took an i/o psychology course during school and a chunk of it dealt with interviewing and finding best candidates (from an employer stand point and equity standpoint), as lots of people who took the course tend to pursue education with the idea of obtaining an HR-related certificate.

The comment about brainteasers vs structured rubrics is sort of surprising to me, given Google's reputation for quantitative data. Speaking from a very high level, structure was really what was emphasized for interviews. It's interesting how culture can get in the way of proven 'fact,' and I love that Google is using their own (much larger data sets) to make these improvements and in/validate other research