Hi there,
I work in the British Pathe film archive, and you may like to see some of our footage on JM Barrie. Some of the canister notes, provided alongside each clip, may also be useful and of interest to you. Please do move this post if it could be in a better section of your site.

For example this 1924 video here called "Sir James Barrie receives Freedom of the Borough of Dumfries and tells her the secret of 'Peter Pan". He appears in it with two girls dressed as Tinkerbell and Wendy:
http://www.britishpathe.com/record.php?id=21406

Then there is this incredibly early clip from 1918 of people admiring the new Peter Pan statue in Kensington palace gardens:
http://www.britishpathe.com/record.php?id=78030

A 1960s shot of the statue, which also shows a Peter Pan themed grotto in Selfridges:
http://www.britishpathe.com/record.php?id=1418

Video of JM Barrie becoming the Chancellor of Edinburgh University in 1930:
http://www.britishpathe.com/record.php?id=4390

In this clip JM Barrie visits Glasgow:
http://www.britishpathe.com/record.php?id=21222

And here's a 1937 video of his birthplace:
http://www.britishpathe.com/record.php?id=36677

There are more clips in the archive, just search JM Barrie, or Peter Pan perhaps. British Pathe have only recently opened their archive fully to the public.

Thanks,
Jack