From contacts in the industry, I heard that the original 35 mm film print for MASH is wider than the televised 4:3 aspect ratio. They are remastering MASH from these films using more of the original frame area. But since the original intent was not a 16:9 release when filming, the wider frames have to be edited for unwanted scenery. Hulu is not showing what is being remastered since it is not yet fully available.