I did experience pixillation on some episodes on set three, which some folks in other threads tried to tell me was "minor film grain". I am now convinced that one disc from that set is defective (at least among the ones I own.)
In set four, that 50 minute first episode may be the "original", but I really miss the scene (cut from the DVD) which I distinctly remember from the first time I saw the "first" episode(s) of the fourth season during prime time while Major Burns is in command where
That sequence is only hinted at in the version included in the DVD set when he and Hot Lips are in line at the mess tent getting served and he comments on how the food should be arranged on the trays. I really wish they had given us both versions. The "original" as included on the DVD seems truncated with that omission. However, the following episodes do seem to be complete, and as hilarious as I remembered them.