The whole meteor / probe droid impact issue was discussed at length back in November, and a conclusion was reached. Reposted below for reference:

Adywan said:

This whole "probe droid" debate is getting a bit out of hand. There is no need to do an editing to that scene whatsoever. It is the same crash seen from 2 different points of view. The whole suspense thing is built up because we have already seen what emerged from the crater . Now when the Taun taun begins to get jumpy we think that it has sensed the probe approaching. You are expecting that to attack and then WHAM its something completely different. This is how i have always thought since seeing it in 1980, and as Darth Bo said before me.