Don’t assume your audience shares your personal interests or cultural touchstones. The best piece of advice I ever received from a client was on a presentation for agriculture experts in Ethiopia. One slide I’d prepared used a metaphor of “fast lanes” and “slow lanes” on a highway. The client said, “We should avoid automotive metaphors – car ownership and car culture aren’t so pervasive outside the United States.”
Metaphors can help people understand complex ideas and quotes from famous people can lend weight to ideas, but unfamiliar references can be alienating. Just because you’re a sports fan, don’t assume audiences will appreciate the wisdom of Vince Lombardi or Sir Alex Ferguson (and if any of my fellow Americans had to Google “Sir Alex Ferguson”, now you know how it feels).
LinkedIn/Facebook research can offer hints for what might resonate with a given audience, and if that fails just ask your client: they’d probably appreciate the consideration.