The scenes in the Guggenheim Museum were filmed during an actual exhibition by Cai Guo-Qiang called "I Want To Believe": The cars in the main entrance suspended from the roof was a piece entitled "Inopportune: Stage One"; The tigers with arrows protruding from them is "Inopportune: Stage Two"; The taxidermy wolves (which the coin rolls between as Beth runs after it) is a piece entitled "Head On".
After her return from Rome Beth receives a phone call from Joan, informing her that she is "front page news" due to her climbing into the Fountain of Love. A cutaway shows a newspaper with the headline "Stupidissima". This translates not simply as "stupid", but rather as "the pinnacle of stupidity".
When Beth and her dad get to the end of the aisle and he lifts her veil over her head, the back of the veil is folded up. When the camera angle reverses, to show the alter, the veil is straightened.
One of the coins taken out of the fountain is a 1 euro coin (an inner copper-nickel part with an outer nickel brass part). When Beth returns the 1 euro coin to Antonio there is a CGI flashback of the coin being thrown in reverse into the fountain. The CGI coin is quite clearly a 2 euro coin (an inner nickel brass part with an outer copper-nickel part, the reverse of a 1 euro coin) and not his 1 euro coin.
During the cab ride scene when Beth just arrived, the footage can be obviously seen sped up as the pedestrian on the left side of the screen is seen walking 3x then slowed down to 2x as the cab passed by.
How many coins does Beth take from the Fountain of Love?
A
Although When in Rome is often compared to the Academy Award winning Three Coins in the Fountain (1954), Beth takes four coins -- a euro tossed in by Antonio (Will Arnett) the artist, a penny tossed in by Gale (Dax Shepard) the male model, a quarter tossed in by Lance (Jon Heder) the street magician, and a collector's coin tossed in by "Sausage King" Al Russo (Danny DeVito), also the Guggenheim Museum's newest patron. For good measure, Beth also takes a poker chip that she later concludes belongs to Nick.
Q
A Note Regarding Spoilers
A
The following FAQ entries may contain spoilers. Only the biggest ones (if any) will be covered with spoiler tags. Spoiler tags have been used sparingly in order to make the page more readable.
Q
Is "When in Rome" based on a book?
A
No. When in Rome is based on a screenplay co-written by screenwriting partners David Diamond and David Weissman along with the film's director, Mark Steven Johnson.