I thought that initially but the lack of complaints from Hall makes me think he weren't shoved
Having seen the highlights on the internet and been within 25 feet of the actual incident with a direct view I am certain that Hall was shoved in the back by the Morecambe forward to cause him to bundle the ball over his own line. The Referee had a clear view of it and might have given a free kick for pushing but I guess that is debatable. Hall should perhaps have already put his right foot through the ball and cleared it.
The defending towards the end of the game was shaky to say the least.