During the Credits
Argo ends with a slideshow of images from the film compared next to photos of the real events. It also shows the real people involved and their Hollywood counterparts. A voiceover starts halfway through the slideshow of an old newscast from when the mission was declassified by President Clinton.
After the Credits
There is no stinger after the credits of Argo.
Special thanks to dkgchris for the stinger submission!