Other mistake: When Michael is playing with "Harvey" the computer, it says whatever he types. When we briefly see the computer screen, the entire dialog for the scene is already typed out, in spite of it including text that hasn't been said yet and that Michael wouldn't know Harvey would say (such as "you ruined a funny joke, get out of my office").
Other mistake: When Jim is editing the audiobook of Jo's autobiography, the waveform displayed on his computer program is inaccurate to the phonetics of the phrase being uttered. The crew of the show simply pasted in a random waveform of someone speaking a different sentence. There are a number of ways to tell it is inaccurate, but one is the periodicity of the waveform during the sibilant [s], which appear be noisy and not periodic. (00:15:20)