Mr. Monk and the Girl Who Cried Wolf - S3-E6
Continuity mistake: About midway through, the new nurse is sitting on Monk's kitchen counter eating a sandwich. She puts the sandwich down on a plate as she hops off, the shot switches to another angle to include Monk as she walks away, and the sandwich has suddenly jumped off the plate and is now lying on the counter a few feet away. Neither of them had time to pick it up or move it.