Plot hole: Gus could not know that Superman was in Smallville in order to give him the fake Kryptonite.
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Suggested correction: It's pretty clear the town made a big deal of Superman's visit. There was a parade, a brass band, and the Mayor gave him the key to the city in front of a sizable crowd. It's not unreasonable to think Gus and Webster learned ahead of time, especially considering Webster ran an operation there.
Plot hole: During the supercomputer's destruction, the 3 electrical probes that are sending lightning to the overhead pylons to draw electricity from them are no longer flashing. So where is the electricity coming from to sustain the computer's lighting system as the fluorescent tubes are still working?
