In Back to the Future Marty has trouble opening a glass bottle, because he assumes that the bottle can be opened by twisting off the cap, which implies to me, that he has no idea, that he has to use a bottle opener, as George (more or less) demonstrates to him. I searched for patents that describe twist-off bottle caps, but the one I found, is dated to 1987, which obviously makes no sense, because the movie has been released in 1985 and is partly set in 1955.
Is it reasonable to believe that Marty had no idea how to open a non twist-off cap, and that he has never encountered such a bottle in 1985 or before? Were twist-off bottle caps introduced after 1955? (I might add, that I am European and I have never seen a twist-off bottle cap before)