Especially early in the season, I'll also mention major rules changes new for this year, and the year's points of emphasis per national & local directives. Yes, the coaches should already know these, but I've found this reminder seems to help, and sometimes prompts a question better answered before it arises, rather than after. After a couiple of weeks, I'll drop this back to something like "Remember the rules changes new this year.", and a couple weeks after that, I drop even that.
Also, if I'm aware of a recent local controversy from experience, or postgame meetings with other umpires, I may bring that up and explain the key point, but only if I'm well aware of the issue. That is preventative umpiring, but seems to work well around here. (In my area, we seem to have a pretty decent group of coaches, and they mostly react well to upfront efforts to prevent problems.)
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Panda Bear
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