There are tons of dumb moves:
She cast off the dock line onto the dock~
She didn't tie the fender
to the correct location and the boat's topsides were damaged.
She let the sheet go instead of easing it off a bit.
She dumper the traveler instead of easing it to leeward and it slammed into someone!
She dropped all the anchor
chain in the same spot by letting the windlass
She didn't tie the dink off properly and it drifted away as they were drinking at anchor...