When Bill is watching the surveillance video of himself and closes his notebook it switches between closed and off to open and playing, from one shot to another.
When Bill and Gary are talking prior to Bill reaching into the sewer, Bill removes his suit jacket but at one point when the camera is focused on Gary your can see Bill's shoulder with his jacket still on.
(at around 5 mins) The device used to remove data from a tablet computer is actually a popular Voice Over Internet Protocol (VOIP) product called "Magic Jack", which is used to make voice phone calls over a broadband Internet connection.