I am on a Windows 7 platform and have an iPad and an iPhone 4, both s/w version 4.2.1
Using iTunes, I can transfer movies to the iPhone, but not to the iPad! I have looked at the iTunes setting on both and they are identical, but no movies make it to the Pad.
PS: It seems that the movie files do get copied as the free storage space is reduced as movies are selected for syncing, but they are not available in iTunes on the PAD. I have tried rebooting but no help.