After the little spy robot gets run over, Patrick Zevo is in the surveillance truck telling the other two guys about tomorrow's meeting with the military leaders. If you watch the red numbers over his right shoulder you'll see them counting upwards until they hit 59:20, then the camera goes to one of the other guys, then back to Patrick Zevo, you see the numbers back down to 59:14 and continue counting up.
When General Zevo is in the arcade playing "Tank Gunner" you notice that his score bounces. It's at -2400 at the point where he only shoots UN Trucks (each truck is -1000 points) and in the next seen he's at 1600 points, down to 400, then up to 3600, then down to -6000, then -3400, and finally -7000.
During the campfire scene General Zevo asks Patrick, "Hey, do you remember that kid who flew a Beechnut into Red Square?" Patrick corrects him by saying it was a Beechcraft, not a Beechnut. Actually, the're both wrong. Mathias Rust, the German teenager who landed his plane in Moscow's Red Square in 1987, flew a Cessna not a Beechcraft.
In the arcade scene, a cabinet of the Konami shoot 'em up Lightning Fighters is shown. However, upon seeing the game itself, it is actually the Sega flight simulator Strike Fighter.
At the end of the film when the Zevo tombstone (stone elephant) is flying through the air, the wire carrying the elephant is clearly visible.
Although the intent is to reference the famous phrase "Klaatu Barada Nikto" from The Day the Earth Stood Still (1951), what General Zevo actually says is "Klaatu Bravada Nikto".
Leslie says he loves "entomology of words." Entomology is the study of insects, while etymology is the study of words.