This is the first movie in the Iron Man franchise not to be directed by Jon Favreau, possibly over creative differences with Marvel or because of his salary demands. He later said that not directing allowed him to have more fun with his character "Happy" Hogan, saying that he was like "a proud grandfather, who doesn't have to change the nappies, but gets to play with the baby."
The first Iron Man movie to gross over $1 billion, and the second Marvel movie to reach this mark, with Os Vingadores (2012) being the first.
The first cut was three hours and 15 minutes long. The final cut was two hours and 10 minutes long.
This movie was originally budgeted at $140 million, but after Os Vingadores (2012) became a huge hit, Marvel Studios and Disney upped it to $200 million, in order to allow Shane Black to make the best movie he could.
The first day Robert Downey Jr. and Sir Ben Kingsley met on-set, they snapped a photo together to send to director and mutual friend Sir Richard Attenborough.
Shane Black: [Christmas] Except for the prologue, the whole movie is set at Christmastime. Black's Máquina Mortífera (1987), O Último Boy Scout (1991), Despertar de um Pesadelo (1996), and Beijos e Tiros (2005) were also set at Christmastime. O Último Grande Herói (1993), which Black did not direct but helped write had at least a partial Christmas setting.