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Allen and Bullock also created the TV series Rango, and wrote the screenplays for the feature films Girl Happy (starring Elvis Presley), The Man Called Flintstone (1966) and Don't Drink the Water (1969), among others.
He received help from Elvis Presley in writing two songs in the early 1960s, which were collaborations: "You'll Be Gone" and "That's Someone You Never Forget." "You'll Be Gone" was also co-written with Charlie Hodge, and appeared on the Girl Happy soundtrack album and as a 45 single in 1965.