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Incorrectly regarded as goofs
After the news breaks about the "internal bleeding" scare with Sharp Cereal, the ad agency comes under fire. However, the scare had nothing to do with the ad agency and they would not have come under direct fire in the way portrayed in the script. Yes, they may have been called in to change the ad campaign, or put a new spin on things, but they would not have been blamed for blood-scare because that was caused by the manufacturer, not the ad agency. The Vic character is given a half dozen or so lines of dialog "explaining" the problem to his wife, but this only makes the plot hole more evident.
When Cujo initially attacks the Pinto, the car's passenger window shatters completely, but does not break. The tempered glass in all automotive side and rear windows does not have the thin plastic layer in it that keeps it intact when struck (as windshields have), and this type of glass will shatter into tiny pieces and disintegrate on impact. This is demonstrated when Mrs. Trenton uses the butt of the sheriff's revolver to shatter the Pinto's glass rear hatch, which is made of the same type of glass.