Although credited to McCartney alone, "Old Siam, Sir" marked "the most collective band involvement" as regards songwriting, Madinger and Easter suggest. Similar in style to "Spin It On", the song features a keyboard riff written by Linda and a Holley-composed middle eight; in addition, Laine helped McCartney complete the composition, an early version of which the previous incarnation of Wings had demoed in July 1976. "Arrow Through Me", a track more in keeping with McCartney's melodic pop style, is a song written from the perspective of a rejected lover. With a musical arrangement that eschews guitar backing for synthesizer, Fender Rhodes piano and horns, Benitez views it as "reminiscent of the techno-pop style of Stevie Wonder".