Inaccuracies
During a discussion about landing a man on Mars, the VP repeats the phrase "Hydrogen and Nitrogen", and states that Mars is made of Nitrogen. This is meaningless, unless you substitute Oxygen for Nitrogen (Hydrogen and Oxygen is rocket fuel, and Mars has abundant Oxygen in its surface rocks).
The show refers to the President using the Antiquities Act to create a National Park. In reality, National Parks require an act of congress. The Antiquities act could be used by the President to create a National Monument.
The scene that has Mallory standing over the shoulder of Sam as he tries the type a birthday message there is hat on the desk behind him. The hat has "ATF" on it. After Mallory leaves then returns with her father Leo, the hat then has "DEA" on it.
The Cabinet always meets in the Cabinet Room not the Roosevelt Room, as depicted in this episode.
The Agriculture Secretary in this episode is a different actor from the one who appeared in the episode, "He Shall, from Time to Time...".
Read more about this topic: Enemies (The West Wing)