If I'm not mistaken two important parts of Picard's character were introduced in the same episode of TNG, "Contagion", in the space of three lines:
PICARD: Archaeology has been a hobby since my Academy days. But why don't we talk about what really brought you here?
WESLEY: It's the Yamato, Captain. I can't stop thinking about her. All those people dead. I don't know how you and Commander Riker and Geordi, how you handle it so easily.
PICARD: Easily? Oh no, not easily. We handle it because we're trained to, as you will be. Tea, Earl Grey, hot. But if the time ever comes when the death of a single individual fails to move us (a pot plant appears in the replicator)
WESLEY: Didn't you order tea, sir?
PICARD: Now that should not have happened.
(Source, emphasis mine)
Is this a coincidence, or was there some deliberate attempt to introduce more backstory and mannerisms around the same time?