Well, last night's viewer letters special wasn't a complete waste, since there was a good deal of previously unseen material in it. Some of the viewer requests were rather pointless, and a couple of the segments were kind of unpleasant (the cinnamon one in particular). But the "blow up a washer and dryer" thing was made a bit less pointless by using it as a way to demonstrate the shooting process.
Some of the things here, like the van explosion test that was confirmed right off so they didn't have enough material for a full segment, reminds me of how much more flexible the show used to be in early seasons, when it generally had three or even four myths per episode instead of just two. There should still be a place for short segments like this, and not just in a once-per-season special.
Parts of this episode drove home how much the US versions of the episodes are cut down to make room for commercials. Like the way part of the "game show" segment was reduced to a montage with voiceover, which kind of defeats the purpose of it. And there was a shot in the closing montage of a horse or cow or something, under narration implying it was something from earlier in the episode, but we hadn't seen it.