No, a “checklist error” did not almost derail the first moon landing

Apollo 11's <em>Eagle</em> moves slowly away from <em>Columbia</em> and prepares for landing.

Enlarge / Apollo 11’s Eagle
moves slowly away from Columbia and prepares for landing. (credit:
/ Apollo Lunar Surface Journal

Update: It’s Fourth of July weekend in the US,
and Ars staff is off presumably safely operating fireworks and
catching some R&R. With the 50th anniversary of the Apollo 11
moon landing rapidly approaching, this felt like the perfect time
to resurface a few favorite NASA stories from the archives. If our
recent six-part
report from a restored Mission Control
haven’t quite satiated
your moon landing needs, this piece on the infamous Apollo 11
landing alarms might do the trick. It originally ran on July 28,
2015 and appears unchanged below.

Last week was the forty-sixth anniversary of the Apollo 11 moon
landing—the first of the six crewed landings on our nearest
celestial neighbor. In the years between 1969 and 1972, 12 human
walked on the surface of the moon
: Neil Armstrong, Buzz Aldrin,
Pete Conrad, Al Bean, Alan Shepard, Ed Mitchell, Dave Scott, Jim
Irwin, John Young, Charlie Duke, Jack Schmitt, and Gene Cernan.
Each Apollo landing by necessity leapfrogged the previous by some
notable amount, because even as Apollo 11 was preparing to lift off
it was obvious that the money wasn’t coming and Project Apollo
might be the only chance to visit the moon—perhaps for a long,
long time.

Even though Apollo 10’s “dress rehearsal” had taken NASA
through all but the final phase of the lunar landing two months
before, there were still a large number of unknowns in play when
Neil Armstrong and Buzz Aldrin separated Eagle from Columbia,
leaving Michael Collins to watch his crewmates descend to the lunar
to stay there forever

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Source: FS – All – Science – News
No, a “checklist error” did not almost derail the first moon landing