If I print anything on-site, the following disclaimer takes up 1/2 of the front page of the report:
This is a preliminary report. The final report will have digital pictures inserted where appropriate and be posted to our website (www.irsindy.com) within 24 hours of the completion of your inspection. Please read over the entire final report prior to finalizing any legal agreement regarding your real estate transaction.
When I get back to the office to go over the report and insert photos (and compare them to the comments), I insert a pic of the front of the home over the top of that statement. It makes it pretty easy, if it doesn't have picture, it isn't the final report and is for immediate informational purposes only.