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A pinhole will usually cause a faint secondary image if it's close to the lens, or some consistent light leakage if it's close to the film, rather than general overexposure, unless it's really large, in which case, it would have affected all six sheets shot under the same conditions.
To check for pinholes, take the camera into a darkened room, take off the back or the lensboard, extend the bellows, and shine a light inside. If you've got a planetarium, then the bellows needs mending or replacement.
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 Originally Posted by David A. Goldfarb
I think what David William White means is that he left the shutter open for focusing, put in the filmholder, and pulled the darkslide, without closing the focus lever on the shutter. I think that's a good bet.
Hey...! That's one that hasn't happened to me yet! My time must be coming, I'm sure...! 
Originally Posted by David A. Goldfarb
An extreme tilt with a close up image can cause an exposure gradient (jbrunner started a good thread on this topic that you could turn up with a search) due to the difference in bellows extension from one end of the image to the other, but you wouldn't get an extreme overexposure from a tilt.
As the film approaches the edge of the image circle, there may also be a gradation caused by light falloff as well, but again, that would not cause overexposure, but the opposite.
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