Revealing mistake: In the scene where Don Draper rips out his diary pages, while he is flipping them, the last two pages contain the exact same text.
Revealing mistake: Bobby jumps on the bed and breaks it, and of course Betty makes sure he knows it: "Great. You broke it." But the bed buckles and breaks when Bobby is at the high point of his jumping, not as he lands.
Chosen answer: At that time, call girls did not command the same amount of money as they do today. By that standard, the $25 would be considered a high rate. Today's upper-level prostitutes can demand far more for their services.
raywest