regarding the HUD (heads up display).
I can't speak for southwest airlines. But with our HUD equipped planes the HUD is only used for CATll/CATlll ILS approaches.
I think everyone is overthinking everything about this mistake.
IF the runways in question had an ILS approach, this may not have happened.
Though, as I mentioned, older planes with older radios may have seen the back course displayed if the front course ILS had been set for Branson airport.
IF I sent everyone here to Times Square in New York with the assignment to find the following as quickly as possible, there would be mistakes made.
GO Find a Tall Blonde Woman wearing a blue dress, and her name is anna.
I'll bet someone would find the same with the name paula.
And don't ever overlook the effect of having a third person in the cockpit, someone who IS NOT a pilot. Pluses and Minuses to be sure.