Looks like IMDB missed a few R. Gang cast members.
I noticed a few cast members not listed in the Rascal cast section. All of them so far seem to be from the silent era but there might be more even during the talkies. Here are those I didn't see listed so far:
Jackie Condon
"Jackie"
1918 - 1977
***************
Jackie Davis
"Jackie"
1914 - 1992
******************
Ernie Morrison
"Sunshine Sammy"
1912 - 1989
*****************
Jay R. Smith
"Jay"
1915 - 2002
***************
What a shame that no one from imdb has either failed to noticed these omissions or have not bothered to add them.