Eliminate all offside challenges by the coaches, but allow the refs to look at a replay to make a call on something they are not sure about ( ie: If all 4 officials have to get together to discuss something, take 10 seconds to look at the replay, and make the right call )
Carolina should have had a PP in overtime for delay of game, but the officials can't use a replay. The weird thing is, the time they take to get together and discuss it takes longer than it would take to look at the replay.
And now Washington gets a PP for the same thing, but the officials didn't miss it this time.