At the 41:58 mark when Toby is telling CJ and Sam about meeting Matt Kelly in the airport bar, he says that Matt makes $55,000/year. In the actual scene from the previous episode, Matt said he actually makes $65,000/year.
When they first enter the Situation Room, Leo asks Jordon Kendall where she's from in order to show her a first-strike drill. However, he later has her entire portfolio up on the screen. He should already know where she's from. Leo was testing Jordon's honesty.
During the Rock The Vote event, the camera shows the band The Barenaked Ladies performing their song One Week. In the audio, both the band's vocalists are singing together, however in the shot they are both jumping up and down, and nowhere near their microphones.
When President Bartlet (Martin Sheen) is giving his speech in East Lansing, the Flag of Mississippi is clearly visible on the stage. East Lansing is in the State of Michigan, and the Flag of Michigan should be shown instead.