As Peggy and Kurt are seeing Bob Dylan at Carnegie Hall, this episode takes place on and around 22nd September 1962.
When Don is in California and he sees a blonde woman at the bar, most likely due to heat exhaustion, he imagines that woman is Betty. In a couple of shots the blonde is January Jones. This is her only appearance in the episode.
Philippe Brenninkmeyer (Willy) and Bjorn Johnson (Klaus) previously starred together in the film Beerfest (2006).