While they are outside, it is raining, and Clark's shirt gets water marks on it. Then the shot pans to Lois and back to Clark, and the drops on his shirt have dried.
When the students are going up to collect their diplomas for graduation, Clark's tassel keeps changing positions.
It would be virtually impossible for a meteor shower to strike the exact same area of the planet. Not only has the Earth and the entire solar system moved since the original strike, the meteors would have meet the Earth at the exact position at the exact time and that's so improbable that it couldn't happen,