The Chrysanthemum and the Sword - S4-E5
Continuity mistake: While Dr. Miller speaks with Don in the kitchen, halfway through the conversation, you can see that her right arm is holding a cup high near her breast. However, in the shot from the back, you can see alternatively that the arm is held with a 90 degree bent, towards the kitchen counter. (00:34:45)
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.
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