It has 'forced' subtitles. Regular subtitles are for all the spoken parts, even if they match the spoken language. Forced subtitles are used to translate spoken parts that are not the default language. So for example, the movie is in ...
Great show, BUT -0- this is a 2018 unofficial release of the radio broadcast. Better quality here: https://relisten.net/grateful-dead/1971/02/20, Charlie Miller transfer of a great soundboard recording.