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Some great tips (especially 14.) many of which we already use when hiring.

I would add 'Introduce the interviewee to the team and try to emulate their future working environment'.

Talk to the interviewee like you talk to the existing members of your team, ask them questions that presume they're of the same calibre and attitude. If someone doesn't seem comfortable with your workspace, communication methods, and discussing high level technical concepts during an interview that's typically a sign of a poor fit to your company's culture.