If you see any mistakes in the closed captioning of MST3k episodes, please feel free to submit your corrections to the link below. Ivan and his crew have a form set up to correct those typos.
As of now, the form is only set up for complete episodes and doesn’t yet account for the three Season 13 shorts, but if you see any typos in the complete episodes, feel free to submit them here. Cheers, and thank ya!