Continuity mistake: When Vinnie uses the price gun in the meat department he takes all the meat he used the gun on and puts it in his cart. In the very next scene he's seen trying to push the cart but he's having trouble because it's suppose to be filled with all those meats. The only problem is that there's no sign of the meat he just put in the cart and the cart is not even 3/4 full.
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Suggested correction: Vinnie's cart trouble isn't about the meat. He's not used to shopping and thus is having trouble controlling the cart on the slick floor of the market, which is isn't used to. So it's a joke both about his inexperience shopping for himself and the cliche about supermarket carts being hard to control.
