When Jesse and Emily are having a meeting at Flavour Station, there is a coffee mug that disappears and reappears depending on the camera angle. Emily- no coffee mug. Jesse- coffee mug.
Among many other times it happens in the series Cassidy has parts of himself in sunlight, and does not burst into flames, or feel pain. When he leaves the hotel after meeting with the angels, riding in the back of a car, where he is obviously casting shadows, etc.