I've mentioned Wikipedia's List of cognitive biases a few times before, because it's easily one of my favorite educational pages on the internet. Functional fixedness, the bias most thoroughly overcome by MacGyver[1. This is just a cheap joke -- I haven't actually watched the series, and apologize to any fans if this is actually a major failure to appreciate the continuity of the show.], is perhaps the most useful one to overcome. Functional Fixedness is the inability to see how an object designed for a particular task might be used for a totally different kind of task. Wikipedia has an excellent example:
if someone needs a paperweight, but they only have a hammer, they may not see how the hammer can be used as a paperweight. This inability to see a hammer's use as anything other than for pounding nails, is functional fixedness. The person couldn't think to use the hammer in a way other than in its conventional function.
I believe this bias is related to Essentialism, which I've written about before, and dismantling essentialism is a good way to overcome functional fixedness. The Wiki page features a section on techniques for getting over functional fixedness, as well, and that's definitely worth checking out.