According to James D'Arcy, the scene in which Jarvis disguises his voice by speaking with an American accent was shot 5 different ways, ranging from a good American accent to a really bad one.
The strongman on the boat, Jerome Zandow, is named after the character of a circus strongman who appeared in Captain American Comics # 5 (1941).
Bridget Regan modeled Dottie Underwood's wide eyed persona on Judy Garland as Dorothy in The Wizard of Oz (1939).
The symbols on the first page of Section III in Peggy's Book of Symbols, are Shadowhunter runes from Cassandra Clare's "The Mortal Instruments."
The aliases listed on the passports found by Ray Krzeminski in a seat cushion are references to famous filmmakers from the passports' respective countries: "Alfred Lean," UK passport - Alfred Hitchcock/David Lean; "Orson Hawks," U.S. passport - Orson Welles/Howard Hawks; and "Federico Rossellini," Italian passport - Federico Fellini/Roberto Rossellini. This explains Roger Dooley's response: "Got a film buff on our hands."