When Jeremy throws his laptop on the floor, what appears to be the battery flies out and lands on the floor next to the laptop, and the cover is completely closed. The scene cuts to a closeup of him looking down at what he had just done, then it cuts to him bending down to pick it up. The laptop is now partly open, the screen is lit, and the battery is no longer anywhere to be seen on the floor.
When Jeremy is picking up Jemma in the video store, the prominent clock over the door jumps backwards about 3.5 hours during the half-minute conversation.
Minute 20: While Henry (Kevin Spacy) stands in front of the fireplace and grabs the signed letter a boom mic shadow fills the entire center of the wall.
Patric tells Henry that 548 x 297 equals 162,765. In fact, it is 162,756.
When Henry and Jeremy are sitting outside discussing their memories of Henry's wife, they appear to be intoxicated, but in fact are drinking from bottles of O'Douls (a non-alcoholic beverage).
The writer/valet talks about riding his moped. However his vehicle is quite clearly a scooter.