I never really got into the George is dead school of listening, but I assumed the title was a joke.
Two of Robert Frost's most famous quotations: "Good fences make good neighbors," and "I took the road less traveled by," are spoken in sarcasm. The second is almost always misconstrued.
Apples and oranges, really.... the "play your record backwards to hear some enigmatic secret message" stuff was a Beatle's shtik; the stuff on DSoTM isn't hidden, it's just faint in some places, and represents comments various people made regarding the theme of the album. plus assorted other odds and ends.... ("he was cruisin' for a bruisin'" was apparently uttered by Roger Water's girlfriend at the time, regarding some guys he beat up in a barfight!)