Movie Goof (continuity error): Water changes its scale at various times during the movie. Sometimes, it features surface tension consistent with the scale of the ants, then at others acts like water on the scale of humans (ie. the flood scene). The directors acknowledge this discrepancy.
Movie Goof (continuity error): Z and Barbatus are standing side by side in formation. The platoon then executes a right face and Barbatus encourages Z to move up putting him side by side with Barbatus again. While this is convenient for conversation, it wouldn't have worked because whomever had been in front of Barbatus in formation would now be in that spot.
Movie Goof (factual errors): In real life, the situation between ants and termites is reversed from their roles in the movie. Ants prey on termites, which are much smaller - and ants are the ones who secrete acid to kill them.
Movie Goof (factual errors): Z would have been in no immediate danger from the water. Ants can survive for days, even weeks, under water.