NSF Thurmont - S6-E1
Continuity mistake: When Donna is writing on a pad to Josh when awaiting surgery, she first writes "Nice hat!!!" A few seconds later we see the pad again, and the exclamation marks have disappeared. Shortly after, they are back.
NSF Thurmont - S6-E1
Continuity mistake: Leo enters the situation room and is told the "planes are on the deck". He watches a video feed as a plane is launched from the USS Lincoln. The S3-B Viking is seen approaching one camera (single vertical tail fin, wing-mounted engines), then from another angle, we see an F-14 Tomcat lifting off (dual tails and fuselage-mounted engines) and moving away from camera. This is supposed to be live video, and it isn't possible two different jets are launching from the same carrier at the same exact moment, so it can only be a bad choice of stock footage by the show's makers. (00:38:55)
NSF Thurmont - S6-E1
Deliberate mistake: While a nice approximation, the helicopter used as 'Marine One' is significantly different (and much smaller) than the real ones used by the real White House (http://www.minihelicopter.net/Marine1/MarineOne.jpg). (00:38:10)
NSF Thurmont - S6-E1
Visible crew/equipment: When the motorcade is driving up you can see part of the film crew in the background.
NSF Thurmont - S6-E1
Continuity mistake: When C.J. and Toby discuss and have a snack in Toby's office while the president waits for Chairman Farad's call, at some point C.J. talks while holding the pack of peanut butter crackers in one hand, and one that she is about to eat in the other. Less than a second and a half later, the camera is back on her, but she is now seen holding a bottle of water that was on the table only seconds before. (00:24:25)
NSF Thurmont - S6-E1
Continuity mistake: When Kate is in Leo's office with the red folder on her lap, the position of her hands changes depending on the camera angle. Viewed from in front both hands are gripping either end of the folder, from behind her hands are clasped together and rested on top of the folder.
Chosen answer: A really annoying innate lack of sense. My friends and family say the same thing all the time, and I'm endlessly trying to correct them. I think people just don't know any better and (ironically) couldn't care less that they're speaking incorrectly.