Potter says he met a woman Danielle in WW1 which was 20 and older than him, which would make him a teenager in WW1. But in ep."Pressure Points" he says he is 62. The year was 1952 so his birth year would be 1890, making him at least 27 in April 1917 when the USA started fighting in World War 1.
When Martine tells Winchester about Spike Jones, his left hand is raised to his cheek when seen from in front, but below his chin when seen from behind.
When Hawkeye and Father Mulcahy are talking in the mess tent, Hawkeye puts his cup down, picks up his fork and starts eating, but in the next scene, he is still drinking from his cup.