The MPEG-2 video bitstream has a resynchronizing mechanism within each picture which allows the decoder to recover from errors. If the video bitstream gets too jumbled, the decoder will get hopelessly lost due to the way the bits are coded. Typically, a slice is a 16 pixel row from left edge of image to right edge of image. Hope that makes some sense to you. BTW, some of your pictures show bright green and pink blocks.
Bright green is all zeroes and bright pink is all ones.
Craig Strom is the guy at WFLD and Marcus Williams is at WDIV in Detroit. I am sure that they would be interested, if only for the propagation report. I work at Harris Broadcast in Quincy. Born in Macomb. I have been doing HD demos and experimental broadcasts in HD for about 3 years now.