Episode #1.7 - S1-E7
Other mistake: When Tsuda and Yamada are in Hayashi's office, Hayashi takes out a sword and executes Yamada. Based on the length of the sword, and the distance between where Hayashi was standing and where Yamada was kneeling, there is no way the sword could have killed Yamada. Tsuda was in between the two and the sword wouldn't have been long enough to reach Yamada given how far apart he and Hayahshi were. (00:17:10)