It's not the video transfer creating them, they're on the film itself. They should be there, but if you have transfer/display levels set correctly they are mostly not very visible. Pre-SE video transfers have very bright levels and are on older standard-def technologies which tended to make them more obvious, but post-SE transfers got rid of a lot of them digitally or crushed the blacks down to the point where they are no longer there. I am pretty sure that even in theatres there were times when garbage mattes were visible.