411A:
It was well known with more experienced guys, especially from the 707 days.
I went through school twice on that airplane in the mid 1960s. As I recall all they taught us is to be careful with the rudder above 250 kias if the pressure didn't reduce. (3,000 to 700 or 750 p.s.i. I think).
So, presumably that could leave the impression that agressive use of the 707 rudder would be okay below 250 kias or even above 250 if the pressured reduced.
It was somewhat academic at my airline since we were never taught to use the rudder for anything other than takeoff or landing or engine failures.