Factual error: In the Gamecube version the last entry in George Trevor's diary is dated "November 31st" November only has 30 days.
Suggested correction: While it is true that November only has thirty days, we have to remember that George Trevor has been lost in the mansion without food or water for a long period of time. He also admits that his sanity is slipping away, meaning that he most likely has lost his ability to properly keep track of time. Also, given that he is on death's door, it's very likely that he couldn't think straight.
Other mistake: In the "Plant 42 Report", it says "It has been effected by the T-Virus differently.", yet it should say "affected".