We all know there are tons of plot holes and continuity errors in the show.
But Im watching an episode in season 7.

The episode where Dick first grabs Kevin.

In the episode, Sam and Dean are at a gas station. They leave Bobby's flask in the car, so they can talk in the store without Bobby being able to go inside and hear what they say.

Literally the next scene, they are all in the car, outside the vamp house, and Bobby is able to "scope out the house" while the boys, and more importantly, the flask, remain in the car.

If leaving the flask on the car kept Bobby from going into the store, how was he able to check out the house, if the flask was in the car?

I know it's not a major plot point or anything. But, jeez. Break a rule put in place in the literal next scene?

Like, come on.