I had a zombie spawn with a witch nose (long/wart). I was no where near a village, though there may be a witch hut nearby that I haven't found. (S)he didn't through any potions though.
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I think it was a zombie villager now, I just don't know where it came from since there is no village nearby that I know of.
There is a 10% chance that a zombie will spawn as a zombie villager regardless if there is a village nearby. I encountered one while exploring in a deep underground cave.
The wiki is my source: http://www.minecraftwiki.net/wiki/Zombie
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