Upon learning immediately after arriving to work that his boss Don has called in sick, art director Bryan Batt tells Peggy that he's leaving and to not tell anyone. Yet later in the day when Peggy is reprimanded for making spelling errors just before closing time and has to stay to retype a document, Bryan is one of the men that walks past her and looks her over as she warily eyes them.
While Betty and Francine are discussing the PTA, Betty lifts her cigarette to her mouth, however in the following shot her arm is back down beside her.
In Spring of 1960, Don Draper comes home from work as wife and kids are having supper. Daughter asks if she can go watch Shirley Temple's Storybook (1958). This program only aired on Sundays.
Peggy is looking at her first paycheck and says she makes $35 a week with $6.75 taken out for FICA, or over 19%. Today (2015), the Social Security portion of FICA is 6.20%, nowhere near what Peggy paid. In 1960 the FICA tax rate was 3% on the first $4800 of income. Her FICA deduction should have been $1.40, not $6.75.
When Don and Betty are driving home from dinner, the gear selector appears to be in "Park."
The camera shows Betty's hands going numb while she is driving. In that clip, the car's steering wheel is upside down.
Don Draper presents his wife with the gift of a quartz wristwatch. The show is set in the early 1960s yet the quartz wristwatch was not developed until 1967 and the first production models arrived in 1969.
In Spring of 1960, Don Draper makes a reference to banging a shoe on the table. Soviet Premiere Nikita Khrushchev's famous "shoe-banging" incident did not take place until October, 1960.
In 1960 one of the copy writers mentions the Twilight Zone and imitates Rod Serling saying, "Submitted for your approval." That line was first used on The Twilight Zone (1959) two years later (May 25, 1962).
Character makes reference to the phrase "military-industrial complex" in scene set in March, 1960. This phrase was popularized in President Dwight D. Eisenhower's "farewell address" on January 17, 1961.
Pete's postcard sent from Niagara Falls bears a postmark of New York, NY.
While discussing their childhoods, Roger mentions his nanny. He says that his parents got rid of his original, German, nanny after the Lindbergh kidnapping. The Lindbergh kidnapping took place in 1932 with the apprehension of a German suspect taking place in 1934. Since the show is set in 1960 this would make Roger 18 years old at the time of the kidnapping.