When Pamela wants to go swimming at sunrise, Wendell's shadow on the pier is way too short for time of sunrise (At the end of July in Ischia you'd get this kind of shadow around noon and 14:30).
When the US flag was draped over the coffin at the end of the movie, the canton (the blue field with stars) was over the upper left of the coffin, as viewed from the foot of the coffin. The canton is to go to the upper right of the coffin, the deceased's left shoulder.
The five Wall Street Journal copies on the table are all the same date.
As the "U.S. Navy" helicopter takes off near the end of the movie, a look to the underside of the stabilizer reveals the Italian roundel.
At the end of the movie, after the helicopter takes off, Pamela and Mr. Carlucci are shown walking and their shadows are on their right side and barely as long as they are tall, as if the sun is nearly overhead. The next shot is from the helicopter looking down at them and their shadows are behind them and at least 20 feet long, as if the sun is low in the horizon.
When they meet at the municipal morgue, Pamela is holding a bunch of flowers. When asked what they are she replies "tromboncini - daffodils." The film takes place during July 15th to August 15th, when daffodils are not in season (this would be the spring). It is implied that the flowers are fresh (the silver foil at the bottom to keep them fresh and stop water dripping), but they are obviously artificial.
Mr. Armbruster says that Romeo and Juliet were buried in Venice, but they were of course buried in Verona.