Yep, in addition to forgetting the steps several times, I once (only takes once for this one) left the black water drain valve on the outside open the whole time we were camping. Got to the dump station and still didn't notice it until I popped off the cap to attach the drain hose.
Then I noticed it. My shoes, socks and legs also noticed it.
Another common peeve is the 4 corner latches. Sometimes one will be in the wrong position when you close up then it will get hung up in the lift rails so you have to open back up to free it.