Evolution (film)/Headscratchers

• Although it's hardly the most obvious example of bad science in the movie, one point sticks out in my mind. Toward the end, Ira and his "team" realize that selenium might be an effective weapon against the creatures, at which point Ira starts talking about how many gallons they'll need to defeat them. The problem? Selenium is a solid at room temperature, and he hadn't been made aware that selenium is the active ingredient in Head & Shoulders shampoo at that point. Shouldn't a scientist of his caliber know better?
  • Gallons are just as valid a measure of volume as anything (I've heard people talk about gallons of gasses, for instance), and easier/faster to say than cubic feet/meters, etc. Plus, people have a better idea of what a gallon is than other measures of volume.