This was Robert Downey Jr.'s largest paycheck up to this point in his career. He was paid over $2 million.
The cast was unable to shoot at the real Mouth of Truth as the nearby square was the target of a terrorist bomb shortly before they began filming in Rome, so the production designer built a replica.
Robert Downey Jr. and Marisa Tomei reenact the infamous Mouth of Truth scene made famous by Gregory Peck's prank on Audrey Hepburn in Roman Holiday (1953), while at the Bocca della Verità in Italy.
Robert Downey Jr. and Marisa Tomei reunite in Captain America: Civil War (2016) and Spider-Man: Homecoming (2017), as Tony Stark and Aunt May.
On late night with David Letterman, Dec 29 1993, Bonnie Hunt said the movie was titled 'Just in Time'.