Continuity mistake: In the scene where Sarah and Chuck find the suspected bomb, Sarah initially tries to disarm it by removing the numeric key pad under the display. She leaves the keypad off when she goes over to talk to Chuck. In the shots where the characters are talking, the keypad remains off but every time the shot changes to a close up of the suspected bomb the keypad is back on, under the display.
Plot hole: Casey needs to get Devon's hospital keycard in order to get into the secure holding area to plant the listening device into the pacemaker before it's implanted into the terrorist. They obtain the key-card by stunning him at his bachelor party and see Casey using it to access the storage facility, backed up by Chuck and Agent Forrest. We then see the terrorists scanning their leader and detecting the implanted bug - Devon is listed as the surgeon. Immediately after this, we cut to Devon waking up from his bachelor party with his keycard missing. None of the three agents involved in planting the bug could possibly have handled the operation, no other agents are mentioned as being present and, as the break-in occurred during the daytime, the staff of the busy hospital would have noticed had an unknown surgical team suddenly taking over one of their operating theatres. So Devon apparently got into the hospital with no key and did the operation while completely unconscious.
Trivia: During the test where Chuck is shown a series of images, he mentions an "Oceanic flight" that was shot down. "Oceanic" is the name given to many ill-fated fictional airlines, and has been used in films like "Executive Decision" and TV shows like "Lost".
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