In addition to those that you have mentioned, Magnum is also seen watching these:
The Murder at the Vicarage (1930) - Case of the Red Faced Thespian
The Bad Sister (1931) - Flashback
The Hunters (1958) - Solo Flight
"Woodpecker in the Rough" (1952) - Treasure of Kalaniopuu
Mentioned, but not seen:
The Magnificent Seven (1960) - Infinity and Jelly Doughnuts
Julie (1956) - On the Fly
Airport (1970) - On the Fly
Airplane (1980) - On the Fly
The Maltese Falcon (1941) - A.A.P.I.
Key Largo (1948) - The Big Blow
(and from Legend of the Lost Art):
The Treasure of the Sierre Madre (1948)
North by Northwest (1959)
Bad Day at Black Rock (1955)
King Soloman's Mines (1950, the Stewart Granger version)
Raiders of Ghost City (1944)
The Perils of Pauline (1947)
Perils of Nyoka, aka "Nyoka and the Lost Secrets of Hippocrates" (1942)
I'm sure there are others that I have missed.
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Higgins: It's not a scratch! It's a bloody gouge!