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.
Continuity mistake: The yellow pen that John Casey stabs into Ty Bennett changes between shots after Ty pulls it out. As he rotates it in front of the camera we can see that the bold BUY MORE logo is only printed once. Still in the very next shot, not only has the text changed direction (reading from the hat-side to the tip-side now), the logo have also appeared in front of Ty.
Continuity mistake: When Sarah shot the Fulcrum agent and Chuck was looking that moment at his mom's bracelet, she has the bracelet on her left wrist and the red watch on her right. However, when she comes back to Buy More to talk to Chuck and hug him, she has the bracelet on her right wrist and the red watch on her left. Also, the first time Chuck showed her the bracelet, he put the bracelet on her right wrist.
Continuity mistake: Near the end when Jeff and Lester confront "Greta" in the cage she pulls out her knife. Jeff attempts to disarm her but she cuts off his tie. She cuts it very close to the top, leaving very little around his neck, but when it cuts back to him after showing the piece hit the floor there is much more tie left.