Despite everyone being gone for weeks, leaving behind half-eaten food to spoil, when Jack returns them, they immediately go on with life as if nothing happened - no wonder about time missed, food spoiled, car accidents, etc.
When Dean arrives in the Impala another car passes by in the distance in a presumably empty world.
Despite losing many of their friends (along with the rest of the world) to Chuck's snapping of them, Sam and Dean don't look into any of them after Jack returns them...not even Eileen.