Kevin is apparently afraid of mummies, however, Creed dressed-up as a mummy the Halloween before, in Costume Contest (2010), to which Kevin showed no emotional reaction. Response: However, at that point in time, Kevin had not learned that mummies are real, so he would not have been afraid of Creed's costume.
In S8E5 "Spooked", which takes place on Halloween, Pam and Jim are shown walking to the parking lot at the end of the day probably later than 5pm because of the Halloween party after work, and yet it appears to be still bright out with the beginnings of sunset. Late October would suppose darkness to be setting in around the time they are leaving, with or without daylight savings time.