They could do worse than start with the offside rule.
When is a player interfering?
When a player is returning from an offside position when can he become involved again without being flagged offside?
Changing tack completely, this Pardew business seems to be dragging on a bit. Caretakers looking after the team at Newcastle, Pardew in the stands at the Palace game, everyone assuming he is their new manager but no official confirmation either that he has left one club or joined the other.