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)
Other mistake: When Michael and Erin go back into Michael's office and start the video on Michael's computer, the "Play" button hasn't changed even though the video is playing. It should have changed to the pause button.
Suggested correction: Michael didn't establish the contract with Hammer-mill. Rather, he locked them up as an exclusive supplier. It's unknown if they were already selling the products to Dunder Mifflin alongside Staples and Office Max.
Wrong, Josh says they cannot sell Hammer-mill products as they are exclusive to Staples so therefore they wouldn't have been able to sell there products alongside as mentioned before until Michael made them an exclusive to them solely, Dunder Mifflin. Therefore the original mistake stands true.