Pete Campbell's father was originally played by actor Christopher Allport who died in an avalanche while skiing in January of 2008.
During a 2012 interview on the National Public Radio program "Fresh Air with Terry Gross," Matthew Weiner told Gross that when Glen goes into the bathroom and interrupts Betty, it was definitely not an accident. Weiner said, "He went in there to see her. He went in there to see her and that's why he stood there and she had to chase him out." Weiner also told Gross that while discussing the scene beforehand with the actor who plays Glen (Marten Weiner, who is also Matthew Weiner's son), Matthew told Marten that deliberately walking into a bathroom to look at an adult woman on whom he had a crush was something he had actually done as a child, and Marten said, "Daddy, you're weird."
The main account in this episode was Bethlehem Steel. During this time, the steel company was enjoying some of its best profits due to construction. The CEO of Bethlehem steel was one of the highest paid CEOs in the late 50's. This was mainly due to lack of competition as most of the steel plants in other countries were leveled after World War 2. Some of the buildings they built were: Chrysler Building, Madison Square Garden, Hoover Dam, and the Golden Gate Bridge.
The album which they are listening to in Pete's office is by Bob Newhart. The album title is The Button-Down Mind Of Bob Newhart and it was a smash in 1960. As mentioned, Newhart was an accountant before he broke as a comic. His style was very subtle. It's also noted that he's nothing like Lenny Bruce, who was an energetic socially-driven standup. This is one of the many times on this show where we learn how styles change the culture.
When Don and Roger take their shoes off before entering Cooper's office to discuss Pete being fired, Roger gets obviously shorter, and Don realizes that Roger wears lifts in his shoes.