If you start recognizing some of the faces over and over as Naboo Guards, this may be why. It has been reported that ILM (Industrial Light and Magic, the sound effect company) technical employees actually composited themselves into the shots as Naboo guards. It is common for ILM employees to be "extras" in George Lucas' films. So, many of the ILM employees were elsewhere in the movie, like in the pod racing crowd, as well.