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a) A jagged hole on the treads? That sounds more likely to be something that was run over. Go to a junk yaerd or something and try to make a hole through the treads. Slicing a tire anywhere isn't easy without a VERY sharp instrument. But going through the sidewall alleviates a lot of physics issues with it regarding pressure and distance through the tire wall.
b) As said above, spares can EASY get into crappy shape quickly. They are meant for a one-time trip to the tire shop my friend... nothing more.
c) If you USE something like Fix-A-Flat, make sure you tell the mechanic when you get to the shop. It shouldn't matter since it's a spare and they won't be popping it off the rim, but it's good measure anyhow. The stuff in those canned inflation products is VERY explosive/flammable.
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