My partner and I are 'mystery shoppers' for restaurants. We have our bill covered plus a bit extra on top (but have to fill out hefty, detailed questionnaires afterwards).
One of the things there's always a whole section on is timing: every single interaction has a time-window in which it must occur. You must be greeted within (t1), you must be seated within (t2). Plates must be cleared within (t3), you must have a 'table touch' (is everything ok with your food?) within (t4), etc.
Some discrete note-taking is often needed (descriptions of all serving staff are required too). We're pretty good at it by now, but have been 'rumbled' once. You can tell when it happens—suddenly you start getting offered the opportunity to try all the different wines they have, for free, given free desserts. Of course it doesn't matter as the meal is paid for, and often slows down the service!