any1 know the officials for today?

Match Official: I Smith

not sure on the rest

Ian Smith was the referee, Joe Cobb and Clint Sharrad were the touchies.

Smith was dung today.

Totally agree with that.

Bad day at the office for "Smiffy" today.

Made a few shocking decisions.

Was it me or was the first Celtic try 2 yards offside?

Nope.

However the pass was 2 yards forward.

Can someone explain to me if it's the linesman or ref that is responsible for checking forward passes and offsides?

Offsides - ref.
Forward passes - touchjudges.

Of course either the ref or the touchjudge can make any call if they see fit to do so.