It's REALLY hard to burn a bridge in our business. The key is NOT to remind people of the mistakes you made in the past. Don't even say, "hey remember when I visited you on set and I embarrassed you in front of your crew. I really learned from that and would never do that again."
Most people who ask this question, are concerned that they didn't follow up. It's never too late to get back in touch.
If you screwed up at your job, there are other fish in the sea. If you had a problem with drugs and alcohol that is now under control, make amends. If you stole somebody's guy/gal, move on-- and don't do that again.
But as far as the business tools I blog about, you tend to make a bigger deal over something than the person, who may or may not have noticed.
If you have a specific situation, put it in the comment section and I'll address it.
For more tips and articles by top entertainment industry coach, The Greenlight Coach, visit www.theGreenlightCoachBlog.com