At the very end of the episode, when the gang decides to "loot" the store while the robbery is taking place Charlie gathers some items and runs for the door first. Charlie is not quite to the door when it swings open on its own. The door is clearly not an automatic door either.
Beer is not sold at convenience stores in the state of Pennsylvania.
In an exterior shot, a Jack in the Box restaurant is seen in the background. There are no Jack in the Boxes in Philadelphia, but there are in southern California where the series is filmed.