Notice when Annie is shielding herself with the sign that reads "Outa Order" from the Critters shooting their spines at her. Charlie comes in and blows one of the Critters away causing its green goo blood to spray all over the sign. In the next scene Annie is shown holding the sign but now it's totally clean.
When Charlie relates his Critter history to Annie and Josh, he says it all started in 1984. Yet Mr. Menges' tabloid newspapers (and the release date of the first film) would indicate the first attack was in 1986.