When Chuck and Casey are interrogating Mark and he receives a text message, he is holding his phone normally, but when the camera angle changes, the phone in his hands is upside down.
In the last scene, where Chuck and Sarah share a cheeseburger, Sarah sits on the couch supporting an elbow on her bare knee. In the next cut, when Chuck asks for the knife, she raises a trouser-leg to get one from her calf holster, baring her knee again.
Chuck arrives early at Sarah's apartment before going to the class reunion and says, "Technically, I'm right on time for my pre-mission debriefing". A briefing prepares you for a mission; a de-briefing is your detailed verbal report of what happened on the mission.