I don't know about coffee, but there was an experiment done a while ago that showed that, for corporate office jobs, people with white-sounding names were more likely to get interviews than people with black-sounding names when their resumes were otherwise identical.
That's far, far different, however, from saying that an NFL GM's draft decisions are likely to be influenced by race. Extrapolating from one to the other is not warranted, IMO.
Why?
There are a number of significant differences.
Football teams are generally more racially diverse than corporate offices, so I'd expect there to be less racism in sports (since racism stems from a certain kind of ignorance, and racial diversity cuts down on that ignorance).
Sports performance is usually easier to measure than office-job performance, so it's easier to tell when your hiring policies are inefficient.
GMs' jobs are on the line when they draft stupidly. People making hiring decisions for corporations often have little to lose when their decisions are dumb (in part because of the previous point -- nobody will know). People making hiring decisions might base their decisions on whom they'd want to work down the hall from and hang out with after work; GMs are probably less interested in that kind of stuff and more interested in winning games.
GMs have a lot more to go on than a candidate's name or resume. Subconscious influences probably play bigger roles when there's little other information to go on. Once you personally interview someone, talk to his college coaches about him, watch lots of game film of him, etc., your initial subconscious impressions won't matter as much as when all you have is a one-page resume that is probably pretty similar to the hundreds of others you've got.
Those are just the things that came to me after one minute's reflection. I'm sure there are plenty of others.