Influencing a defender's decision - such as, by dragging them out of position to mark the offside attacker or by influencing them to play the ball, doesn't constitute interference. Interference needs to be impacting their ability to play the ball - FIFA made it clear with the offside law changes a few seasons ago that they don't want referees to be mindreaders and thinking that a decision was only made because of a player's position, and that a poor decision by the defender is simply their own problem.
So, given Muscat wasn't impacted by a direct challenged, there's no possible way he was interfered with. Knowing that you should do something because somebody else is nearby isn't the same as that person actually interfering with you. Without the law being like this, we get into the situation where offside may or may not be called just because a defender is marking an offside attacker. Not great territory. Having said that, I'm more trying to point out how it 'is' rather than how it 'should' be
Though concerning, I see too many AR's in the HAL give an 'early flag' for 'passive offside'.
All that leaves us is interference with the goalkeeper - but given that the keeper wasn't clearly seen to change his position because of Berisha's challenge (the LOTG this season give some leeway for when an attacker's deliberate action is clearly impacting upon a defender, usually the keeper) - ie it was the position to block the ball anyway - and it was the defender putting the ball to the other side of him that was the problem, I don't think Berisha prevented him from playing the ball.
But, that is moot. Muscat played the ball - so even if the keeper was interfered with, that occurred afterwards. Once a defender plays the ball, offside is nullified - even if it's a misplay.
What sucks is you know when you make a desperate lunge for a ball going past you and you get a toe on it and it goes past you anyway, or when you try to head the ball but can't jump high enough, skims off the top of your head and goes to the attacker 15 yards offside? He can now play that ball with the new LOTG. Which is going to be a lot of fun at local level.
That was a very different scenario though - blocking the keeper's view on a shot constitutes interference, and I agree that the keeper's view was blocked there but apparently the referee didn't think Cahill was in line with the kick.
As for Cahill's red card - the problem that always arises with red cards for OFFINABUS (and yellow for dissent, for that matter) is that there's so much that's let go that when they are pulled up, it's inconsistent. Calling a ref a f****** disgrace, as he did, certainly warrants a red - but it highlights how many times referees have been called worse in the HAL without so much as a comment. Personally - and I say this as a spectator as well as ex-ref - I'd love to see a firmer hand on this sort of malarkey. Just look at the players mobbing the ref/AR to clearly see just how badly we need to be stamping down on this. Beath shouldn't have to spend that long just getting players to go away so he can have a discussion with his AR - but it's the standard that, unfortunately, has been set in the HAL.
Though I was disappointed to see that no action was taken against Berisha for throwing the ball at Bouzanis after the goal. Inexcusable from the officials. And inexcusable - though not surprising - from that diving thug with the most punchable face in the league.