Clark's forehead wound disappeared during her walk to Mount Weather, and then returned later.
When Lincoln is found in the underground car park, all the vehicle tyres are still pressurised even though it's been 97 years.
Although no strict timeline is provided within an episode, travel durations between one point and another appear to be within the same day. Mount Weather, Virginia and the Grounders' "village", which is located near the National Mall, would take at least 19 hours on foot, according to Google.
Commandar Thelonious Jaha holding the girl hostage with a knife put on her throat, is not expected of Thelonious. So far, he had remained a peaceful man and had not resorted to physical violence of any kind at all. It is not in his nature to hold a girl captive like that. The same is very much in the nature of his assistant, Kane. It can be wondered why the director preferred to Thelonious enacting that when he/ she could have easily shown Kane doing this act.