And I always thought of it as a little foreshadowing that human error and/or faulty design can defeat the best-intentioned technology, which is also a theme of the story.

But the "two females" gag works, too.    The intent could have been either or both - or, as red says, maybe it was just to show Malcolm's a bit of a dork.

Rare, but it happens sometimes.  The highest-profile example is Barbara Streisand and Katherine Hepburn tying for Best Actress in 1969.

Die Hard 8 - McClane dies.  Hard.

To be honest, that would be an ending that would return the series to its roots - although it should have been maybe the third installment, before McClane became a full-on cartoon character. 

Could have been a hell of a movie to have the original McClane - the one that could actually get hurt - go up against a foe and (presumably) win, but get mortally wounded in the process and croak at the end.   

Of course in Franchise-World where we live, this would never ever happen.   Interesting to think about, though.

/tries not to make a joke about how deep the rabbit hole goes
/fails

Yep.   Road Warrior is one of my all time top fave movies.

/may have made a full-on Road Warrior costume sometime in the past
/may still have it
/don't judge