Sky sports says Friday, I was sure it was a Sat though before.

Neither were tries, both clear knock ons. Randalls try should of been disallowed it nearly cost us the game.

So if Semi had performed exactly the same action but running towards his own line instead of Wigan's that would have been play on?

Never got an answer to that at the time, don't expect one now.

Semi's disallowed try was correct, he knocked the ball forward towards the Wigan try line.
Randal's try should have been disallowed for the same reason.

If Semi had been running towards his own line and he knocked the ball forward towards the Wigan line it would still be a knock on. Not sure how he'd manage that though!
Still go with a knock on for both and they should both have been disallowed.