I think one of the key things (if I remember correctly) was he dropped Stekelenburg for the returning Forster. Thankfully for us, he then brought the keeper who'd had the 10 game losing streak with him, so he could do it all over again.
Yeh Forster came back in through injury but he also switched to a 3-5-2.
He had a back three of Fonte, VVD and Bertrand, with wingbacks and a really energetic midfield (we don't have that), with an equally as energetic forward line of Long and Mane either side of Pelle, who could bring the ball down and hold it up in the event they needed to go long.
Basically, a bit of everything.
The one thing that impressed me is that after something like 10 games unbeaten, they lost two on the trot, so he switched back to a 4-2-3-1, and they had a brilliant run to the end of the season.
I'd like to see that from him now, but I can understand his limited (i.e. - all very similar players) options (and they are limited, Davies ain't gonna solve our issues despite the clamour for him to play as an example) may be effecting his thinking.