Feet represent the past, the path we've taken to get to the present moment.
A shoe store is a commemorative holiday or special day devoted to a past event.
Removing socks seems to indicate being ready to unload all of this lifetime to be spirit again, represented by the naked body. But then, Toby Keith's naked backside points to a 'full moon', thanks to his song "Does that blue moon ever shine on you?"
To kick something is the single repeat of an event. Kicking around a severed head is the repeat of a crazed person trying to decapitate a police officer.
Stomping is multiple repeats.
Clean toenails = paid the price already. Dirty fingernails = actively misbehaving.