"Doma Smo," is Croatian for "We Are At Home".
Negan said the use of the infamous whistle came from his bedridden wife, Lucille, who had terminal cancer. Whistling was her way of getting Negan's attention immediately. His wife was played by his off-screen partner Hilarie Burton Morgan in Here's Negan (2021)
Pasticada, which was offered by The Croat, is actually a Croatian version of Beef Stew.
The zombie apocalypse happened in 2010, so the Freedom Tower was not built to completion. The Freedom Tower was erected on the site of the former Twin Towers, which included the World Trade Center, which were demolished on September 11, 2001 due a terrorist attack. The project was started on April 27, 2006, and the building opened (in real life) on November 3, 2014.