Since it's set in a stylized 1950s, rather than a styled 1930s, and is an homage to 50s Drive-In Movies, rather than 30s Saturday Matinee Serials, I wouldn't expect it be tonally consistent; that would be inappropriate.
Makes sense. After all,
Raiders was made in 1.33:1, was black-and-white, came out in twelve-minute installments, was often nauseatingly racist, had terrible sets, and didn't feature any blood at all. And those 1930s serials featured heroes who'd committed statutory rape all the time.
By that logic, you could say that because most 1950s drive-in movies sucked, so it was a brave and laudatory move of Lucas and Spielberg to make a crap film. I mean, it's only appropriate. Anything else would have been a craven sop to ADD-plagued ignorant kids.