Continuity mistake: At the diner, before Mrs. Duncan comes to confess about murdering her husband, Brennan takes a sip of tea. Her glass at this point is less than half full. When Mrs. Duncan walks in, the same glass is now almost full.
You Can't Miss The Bear - S1-E1
Continuity mistake: When Nancy goes into her guest room with Silas and Quinne in it, the things she are holding change position in between shots. (00:28:35)
Continuity mistake: When Kellerman orders Hale to give him his weapon, Kellerman pulls out his own weapon with his left hand. In the next shot, his gun is in his right hand, and he then transfers it back to his left. (00:36:45)
Continuity mistake: When Charlie is in his office talking to Larry, while going over the potential killers and victims, he writes the word "Killers" on the board and circles it. Then, when Charlie notices that Larry has left and says "gone", the writing is different. The 'k' is wider, and most noticeably, the left side of the circle is gone, and the loop in his 's' disappears. Once Charlie goes back to working, the word changes back to how it was originally written. (00:38:20)
Visible crew/equipment: After the BAU capture "grandfather," when Hotchner has Reid on his cell's speaker, just as Reid says, "He spent 22 months in prison...," we can see the shadow of the boom pole and mic on the ground behind Hotch. (00:33:50)
Continuity mistake: When Carl is staying with the son Earl in his motel room after he separated from his wife and starts going back and forth for the room, there are two socks on the floor by the bed, one of which changes position in another shot.
Visible crew/equipment: Just before Chief Johnson and Sgt. Gabriel get out of the car at the victim's parents' house, a crew member and lighting equipments are reflected in his sunglasses. (00:07:20)
Continuity mistake: At the end when they are confronting Harmony, they pick up the water glass for DNA testing. In the next shot over her shoulder, the glass is still on the table. (00:36:55 - 00:38:09)