In the context of aircraft, to me (and Wikipedia) The Blitz occurred in 1940-41.
However, I am watching an "Our Gang" short that was made in 1936. In that short, an old women's dining room was "invaded" by a toy airplane. She yells at her servants, about the Blitz.
The comedic context is that this old woman, upon seeing an airplane "attacking" her has flashbacks to "the blitz". This being the punch line, I can assume that the writers would think that the audience would recognize the comedic value of that term.
How could this be, in a movie made in 1936?
The concept of Blitzkrieg, in the context of land battles was developed between WWI and WWI, but it is unlikely that a movie audience would recognize the word, and especially in the comedic context is an airplane.
I have done a little research on the term "The Blitz" but can't find examples of that prior to 1940
Could this be a slip up on MGM's part and now exposes the fact of time traveling? Nah, probably not. But it is interesting to see a movie of 1936 use the term "The Blitz" as a comedy punch line 3-4 years prior to it being used "for the first time" to describe the bombing operation over Britain.
I doubt very much that the term originated in an Our Gang short and that the Press stole the idea four years later.
Still I wonder where did the writers get that term from in that context in 1936?