[Incorrectly regarded as goofs)
Contrary to another goof listed - it should be noted that an entire scene is spent introducing the main character to the concept of personal hygiene. Due to the appearance of a rudimentary shower, bar of soap and the family all having decently neat haircuts and clothing free from grime and dirt, it is therefore not unreasonable to assume that these characters would want to maintain personal grooming routines for some semblance of normalcy, in spite of the post-apocalyptic setting.
Contrary to another goof listed - it should be noted that an entire scene is spent introducing the main character to the concept of personal hygiene. Due to the appearance of a rudimentary shower, bar of soap and the family all having decently neat haircuts and clothing free from grime and dirt, it is therefore not unreasonable to assume that these characters would want to maintain personal grooming routines for some semblance of normalcy, in spite of the post-apocalyptic setting.
The three women hiding in the forest in a post-apocalyptic world still keep their armpits clean shaven.