During the Credits
There are no extras during the credits of Saw VI.
After the Credits (spoilers)
There were no extras after the credits of Saw VI in theaters; however, the director’s cut video includes an extra scene after the credits showing Amanda talking to Corbett Reinhart, daughter of Lynn Denlon and Jeff Reinhart in Saw III.
To recap from Wikipedia:
Corbett was kidnapped and hidden away in Jigsaw’s lair, given a limited air supply. Her father learned of her presence in the warehouse upon killing Jigsaw, revealing that he would have to play another game to get Corbett back. However that game never materialized since he was shot dead by Agent Strahm in Saw IV. It should be noted that Hoffman was holding one of Corbett’s toys in a scene in which he conversed with Perez. Corbett had a brief appearance in Saw V where she was seen with the stuffed animal being taken out of the warehouse and given to a police officer by Lieutenant Hoffman.
In the extra scene, Amanda tells Corbett to not trust the one who saves you, in reference to not trusting Hoffman who would later save her in Saw V. This would also explain the scene in Saw VI when Perez tells Hoffman that, “everyone knows” about him and how they knew.
Special thanks to Zack, Stephen P. and Logan for the stinger submissions!