Continuity: After Archie shoves the car jacker into the trunk, the would-be thief shoots a hole in the lid through which his blood squirts as he is made into 'fuel'. The hole, and the rag Archie uses to block it, are no longer visible when Archie throws the crippled veteran into the trunk, but reappear later in the film when he pulls out the rag so that the car will run out of 'gas'.
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