From 47:47 -when Holden first pulls up the passenger's window is 1/2 way down, then goes to all the way up, then goes back to 1/2 way down.
The Playboy in Bill's box starts out behind a picture frame, but is suddenly in front of the picture frames as they walk down the hall.
When Holden and Tench are looking at the images of the dog with the slashed throat Tench comments that 'Scottish Terriers can be yappy'. The dog in the picture is a Fox Terrier not a Scottish Terrier.
The corrections officer who has Holden sign a release speaks on behalf of "the United States government." He works for the State of California, not the federal government.
As agents Ford and Tench get their first look at the sub-basement room their supervisor has assigned them for their new project, a Radio Shack TRS-80 Model III computer is visible on the shelf near the water cooler. This computer would have been brand-new at the time of the story and unlikely to be stored with other obsolete or surplus equipment.
In the opening scene there's a Weller model WTCPT soldering iron sitting on the desk, that was not introduced until the mid 1980's.
The idea that an FBI agent would think he could bring a firearm into a prison is ludicrous.