Yet another banner year for Don Draper

With last Friday’s agreement between Matthew Weiner and AMC, “Mad Men” enthusiasts can enjoy their Season Four DVDs with the certainty of a fifth season for the popular drama.

Contract disputes will delay its start, and the fourth season’s wild ending makes it a long wait. The 13 episodes witnessed some serious tonal changes and showcases some of the characters truly at their worst. Jon Hamm is absolutely brilliant as Don Draper in “The Suitcase” while co-star Elisabeth Moss continues to blossom as Peggy Olson all season. Both are early Emmy favorites.

Extras are few in quantity, but great in depth. They include several short documentary films on subjects like advertising strategies, the Ford Mustang and divorce in the 1960s — all require more patience, but at greater reward to truly interested watchers.

The usual audio commentaries are very good as well. Matthew Weiner and the technical staff provide the most interesting insight, while Christina Hendricks is also charmingly observational.