When Obi-Wan Kenobi visits the cloners on the planet Camino (about 40 minutes into the movie) note his decent to the landing platform when he first arrives. For a couple seconds, the camera is at a great enough distance to see the entire building structure and the water surrounding it.

Look at the waves, for the brief time that they are on the screen, and note something curious about them: They are not moving. A couple of them do appear to be slowly flowing, and even breaking, but the majority of them are as still as a stone.

When you're looking for it, it should be impossible to miss.