JFK wrote:4. A Brotherly Love still was (seemingly) taken on the same set as the Dane Keaton photos-
Thanks for that last photo. Interesting to compare with the stills with Keaton, Dane also seems to wear the same costume (underneath the towels), so they were almost certainly taken at the same time.
It would be nice indeed if a hitherto unknown Keaton appearance turned up, however brief, and if it turned out that this had escaped the filmographies only because the film hasn't been seen. On the other hand, it seems likely that even a cameo by Keaton would have been recorded
somewhere, in some of the contemporary film reviews or film yearbooks.
Doubtful IMDb credits keep appearing - not too long ago, both Chaplin and Keaton were listed in the cast of
The Criminal, a 1915 short featuring Norma Talmadge. Some alert Nitratevillains were able to quickly fix that!