Leeds United have collected 14 yellow cards in their last five Premiership matches.
West Ham's Marc Vivien Foe has been booked in each of his last four Premiership appearances.
David Elleray, who issued fewer cards than any Premiership referee last season, began this one with four in 74 minutes at Upton Park after replacing an injured Paul Durkin.
Mansfield's David Kerr received the first red card of the new campaign after 11 minutes at Brighton.
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