Not quite a bug, but I noticed these two typos in the second dialog sequence (the one started by the final boss) in day 20:
On 2/22, "is time" should be "in time"
On 4/22, "they keys" should be "the keys"
(And I don't know if this is intentional / important, but in the dialog for many of the missions, the number of spaces after a period is sometimes 1 and sometimes 2. I don't mean to be nit-picky, just throwing my observations out there.)
yes, there are a few more typos on day 20 then anywhere else. i think in the first dialog sequence there was some of the in's and of's confused.