Just One More Time is the title of a promotional film that I'm guessing was meant to be filler on one of the three networks when any one of them had time to fill from running one of the theatrical movies that ran a little short in the alloted two-hour slot. What this short was promoting was the upcoming release of That's Entertainment! M-G-M's 50th anniversary compilation tribute to their great musicals of the studio's Golden Age. The clips from the vintage films and the surviving stars' hosting segments are virtually the same as what appeared in the feature but many of the host scenes are shown at different angles than what appeared in the final print. And those dilapidated sets they posed in front of are shown being torn down. You also see people in the editing room picking scenes from a movieola. Interesting to look at but not really necessary to watch if you've already seen the first TE.