While Emily French is in the restaurant she is smoking a cigarette. She puts it out to pee in a cup. After she finishes, her cigarette is back intact and she takes a drag of it.
When Agent Divine is watching the dog in the kennel in Hollywood you can see a red chewing toy next to the dog. In the next shot of the dog the toy is gone.
In the "burro casting" sequence neither of the animals being considered are burros. They are both mules - the sterile offspring of a burro (donkey) and a horse.
The same extras playing tourists, wearing the same clothes (notably a woman with a fringed leather jacket), can be seen watching the "Ponderosa" theme park show, in two different scenes supposedly months apart.
This movie is set in the mid-1980s. The Westin Hotel was built in 1994. The Providence Place Mall opened in 1999. Both are shown in the movie.
Though the film is set in 1985, the United Airlines plane shown at the Rhode Island airport is painted in a color scheme that was not used until the mid-1990s.
The movie is set in the mid 80's. When Agent Devine is sitting on a bench asking people for script ideas, a green VW New Beetle passes by.