Factual error: In golf scene, Kevin Spacey is supposed to be playing golf in St. Andrews. The intensity of sun and the surrounding fauna suggests they are actually playing on a course in the mid latitudes of the US. (00:11:30)
Continuity mistake: During his second interview with Jack, Stone tilts his body to the right in the front shots, but remains straight in the back shots.
Visible crew/equipment: In Africa, after checking into the hotel, Wilson slides the curtains out of the way. As the camera pans to the right, you can see the reflection of the cameraman by the (bathroom?) doorway on the window's glass.
Factual error: When the Senator is looking at the rent ledger, there are entries for each property as well as the date that money was collected. One of the dates is 2/29/74, yet 1974 was not a leap year. The only leap years in that decade were 1972 and 1976. (00:56:30)
Factual error: Bill is awakened by a clock radio. The AM frequency shows it goes up to 1700kHz. The AM expanded band was not introduced until 1993. In 1980, devices only received AM frequencies up to 1600kHz. The SONY clock radio in the scene was not from 1980. Plus, the alarm sound it made wasn't popular until the late '90s.
Deliberate mistake: The (fake) confession letter was postmarked from Ohio and sent to Allison Connor, 331 Henry Lane in Hilliard, MB 21243. No U.S. state has a postal abbreviation of "MB." The way the "B" was written in thick bold letters made it resemble a "D" - "MD" represents Maryland (where the film apparently takes place). Also, there is no current 21243 zip code in the U.S. There is a 21241 for Baltimore City and the next consecutive zip code is 21244 in Baltimore County. The created address LOOKS real. (00:50:44)