After the meeting to determine if funds will be provided for the club, the goons head back to their office. The leader opens the top drawer of his desk and removes a gun, he then opens the second drawer and rifles through it. He doesn't find what he needs and closes it. He then opens the third drawer and removes some bullets. The camera angle switches to a farther away shot and it shows him closing the second drawer instead of the third one.
During the car chase at the beginning, the weather goes from sunny with blue skies and completely dry pavement do overcast, raining and soaking wet streets. The change happens as soon as the van turns a corner as it is pulling up to the Boys and Girls Club building.
Near the end MacGyver is trying to hide from the guy with the gas can. Mac isn't stooped low enough and his head is visible over the car's hood. There is no way he could not have seen from his position.