The Dippy Doo Dads began filming in mid-January of this year. As already stated, the Our Gang series had a few extra 'monkey episodes' during 1923, which is probably no coincidence. It's possible that Norris and Norris were involved in "Back Stage" (no. 13), "Fast Company" (no. 16), "Stage Fright" (no. 17) and "No Noise" (no. 20).
Filming wrapped on the last Dippy Doo Dads episode in early January of this year, and that's the last verified involvement of Norris and Norris with the Roach studio.
The earliest casting directory in which I've seen the Norris ad is from September of this year. The ad was repeated in November, and makes mention of the Dippy Doo Dads. The photograph identifies the simians as the 'Norris Monkey Movie Stars.' In addition to specializing in monkeys, they could also provide 'white collies trained for stage and screen.'
A June 1930 casting directory is the last in which I've seen a Norris listing.
According to IMDb, Cal Norris played a small part as a vaudevillian in the Burns & Allen feature "Here Comes Cookie." It isn't clear whether or not C. I. Norris was involved.
©Jan. 19, 2008, by Robert Demoss.
2008 updates: 7/6.