"Feet First" was the sixth most popular movie at the U.S box office for 1930.
The ship shown leaving Hawaii is the S.S. Malolo of the Matson Line. She was built in Philadelphia in 1927. During WWII she served as a troop ship. After the war she was sold to the Italian Home Lines. After 50 years of service with several other companies, and under different names, she was sold for scrap in 1977.
The float plane shown picking up the mail is a 1926 Savoia. Savoia-Marchetti, American Aero: American Aeronautical Co, Port Washington NY. Savoia planes were more often called American Marchetti to disguise their Italian origin of design although they were built in the US under license. It was equipped with a 90hp Kinner K-5. Wing span: 34'1" Length: 25'0" Load: 699 lbs. v: 86/75/40 range: 290 miles/ceiling: 7000'. Cost: $7,375 with starter and navigation lights. NC378N was one of only 25 built in this configuration.
A movie industry Trade Paper item in August 1930 announced that after "Feet First," Harold Lloyd's next talking picture comedy feature for Paramount will be a football comedy. This eventually was never made - his next feature was Movie Crazy (1932).