Interesting interpretation of Javert's confession
In the other versions I have seen, 1952, 1992 and 2012, when Javert confesses to Madelaine that he doubted his background and thought he was Valjean, it seemed that it was a ploy . He told him about the mistaken convict who was going to be sentenced in an effort to spot guilt or set him up.
Laughton seemed genuinely distressed and ashamed when he confronted Madelaine. I found this interpretation much more interesting and definitely excellent acting by Laughton.
I really like this version.