Via Nerdist.com:

The Last Jedi featured a number of surprises, but the biggest of all the twists and turns was also the smallest: Yoda. The wizened Jedi Master introduced in The Empire Strikes Back returned to give Luke Skywalker advice in Episode VIII, bringing the iconic character into the modern Star Wars fold. To get his appearance on Ahch-To right, Neal Scanlan—head of the creature shop (which is also responsible for aliens)—knew they had to make a puppet from the instant he learned of Yoda’s return. He told Nerdist the experience of creating Yoda was a gift.

“To know that we were going to have Yoda, we just said, ‘Look we need to go back and look at Empire Strikes Back, we need to look at how Stuart [Freeborn] created Yoda because that is the most pure puppet moment,’” Scanlan said. “It’s Frank Oz, who is one of the greatest puppeteers ever, and we knew that Frank was going to redo this. We just felt that it was absolutely right and proper that we create the puppet in the closest likeness to the original and to give Frank exactly what he had the first time around.”

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