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Also on the Blackboard QPR appears, this is a reference to the British football team "Queens Park Rangers", of whom Tracey Torme's Dad was a player in the 40's. See more...
Sliders (1995) - 0 mistakes in season 4
starring Charlie O'Connell, Cleavant Derricks, Jerry O'Connell, John Rhys-Davies, Kari Wuhrer, Robert Floyd, Sabrina Lloyd (add more)
I'm afraid there aren't any mistakes listed for series 4.