"What's the difference between a witcher and a tub of dung?" Geralt answers "Ah, I know that one", but we never get to hear the answer. The answer is: "the tub".
Henry Cavill dehydrated himself for scenes that involved nudity, such as the bathtub scene. He would drink less water for three days. On the third he would drink no water, while on the fourth they would shoot the scenes. He explained that this process would make his skin thinner and sit better on his muscles.
Geralt's, Jaskier's, and Yennefer's part of the plot are an adaptation of the story "The Last Wish" from the book of the same title.
Principal photography for the first season began on October 31, 2018, in Hungary. In March 2019, production moved to Gran Canaria, in the Canary Islands, with some scenes planned to be shot in the islands of La Palma and La Gomera as well. Filming ended in Ogrodzieniec Castle in Poland.
This marks the first time that Geralt and Yennifer meet.