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The comment about Watson gaining weight due to being married is said explicitly by Sherlock in HLV.
One other possible one they didn't catch: Sherlock's hands on John's knee (or was that the other way around)? In "The Problem of Thor Bridge," while on a train on the way to their case, Holmes rests his hands on Watson's knees (while discussing Watson's revolver, no less).
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This is quite interesting - for all those who wondered about the matchbox: