When brian is reading the pawn shop ticket he is holding it ith both hands but in the next scene he has his left hand in his pocket.
When Antonio is driving Joe, Brian and Helen to the beach, his cab clearly has no windshield. Also, while the three are whispering in the backseat, he looks at them in a rear view mirror which isn't there.
This second suitcase was in the same locker (#5 middle row second column) as the suitcase the guys found in the pilot episode. Since their deceased father hid them both, it should have been there eight years earlier.