I see activity from the Trello board show up in the conversation but I don't know if there is a way to mention a card or board and have it automatically linked in.
You can copy the card or board's link and paste the link into the comments. Trello will "trellofy" the link so that it doesn't just look like a URL. Is this sort of what you're looking for? Trello used to have functionality to use a hashtag plus the card number to "mention" a card, but that feature is no longer available.
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