You can put notes in your cell phone when they get up or if they have you wait for them. What they were wearing, eye/hair color, tattoos, glasses, scars, etc., as well as those around you may see. The apartment number(s) shown, wall color, cabinet color. Anything you notice on-site that can prove you were there, like something being worked on or even if you hear Ann Jones ask for a package she was expecting. Do not forget their business card or at least a floor plan or other promotional material, if not all. If the person you meet with is new and they write their name on a business card but do not include their last name, ask for it. And yes, it is a boring, repetitive and long report to get used to! And just as Lisa4984 stated, it gets a lot easier as you become experienced with them.