[1] Wigan won their first Championship this season beating Oldham 7-3 in the play-off final.

The requirement was that clubs would play all the others from their own league (Yorkshire, Lancashire or Wales) home and away.

[4] The disappointing results and the attendant lack of income and support made 1908–09 the only season in the Northern Union for three of thee Welsh teams, as Mid-Rhondda, Aberdare and Barry either left or were expelled from the Northern Union at the end of the season.

[5] The joint top try-scorers were Joe Miller of Wigan and Frank Williams of Halifax with 49 each.

[7] The semi-finals were played on 17 April 1909, Wigan beat Batley 18–2 while Halifax and Oldham drew 3–3.

[10] The Championship final was played on a rainy afternoon of 1 May 1909 before a crowd of around 12,000 at The Willows in Salford.

Wigan's Dick Ramsdale took his side back into the lead with a try in the thirtieth minute.

[14] In November 1908, Edward Crofton, a Wigan coal dealer, was jailed for two months with hard labour for attempting to bribe two Wigan players, Lance Todd and Massa Johnston, to throw the club's game against Hunslet.

The defendant maintained that the first meeting never took place and that the second occasion was simply a joke remark on his part and that he had never actually offered either player any money.

[20] Ebbw Vale beat a Rest of Welsh League side 20–0 in a season finale.