Well, to be fair, though... Manos was shot silently to save money with the PLAN of dubbing in all the voices later. That is how naively conceived the entire project was. It was El Paso in the early Sixties and a fertilizer salesman thought it would be fun to do a drive-in cheapie flick independently... back when there wasn't "independent film" as we know it today or... more accurately, knew it in the late Eighties and early Nineties. That independent film hasn't existed in a decade, either. Different conversation.
Even in the non-MST version, though, which I own, the leg prostetics are really only clearly visible a couple of times.
And... the visual performance of Torgo is all facial-ticks and weird limping, overdub or no overdub.
A performance that could've been competent in a completely different movie but... not in what Manos ended up being.
In the context of Manos, it is completely fuck*ng hilarious. Manos is one of those rare movies where the non-MST version has more comedy replay value than the MST version. There is something added, in the fullness of its start-to-finish innocence, in watching it unspool as what is supposed to actually be a feature length movie.
Some of the higher-level absurdity is lost in seeing it broken up and framed, as opposed to an entire heartbreaking failure.