[1] At the time, it was common practice in Ireland for merchants to purchase distillate in bulk from whiskey distilleries and then mature it themselves in their own casks in bonded warehouses.

Using distillate obtained from Jameson's nearby Bow Street Distillery, Mitchell & Son matured whiskey in a mix of casks that had been used to hold both dark and light sherries in their cellars under Fitzwilliam Lane in Dublin.

[1] Mitchell & Son's whiskey was originally marketed as "Pat Whisky", with the labels featuring the logo of a man on a green background.

[2] According to posts on the Irish Whiskey Club's Facebook page in August 2018, Red Spot was re-introduced to the lineup in November 2018, again based on old family recipes from before it was discontinued 50 years prior,[3] and Blue Spot was re-introduced to the lineup in November, 2020, after being discontinued for 56 years.

[2] Because Green Spot is produced in limited quantities (only 12,000 bottles per year)[5] and was historically mainly sold through Mitchell's & Son's Dublin shop, it was previously difficult to obtain outside of Ireland.

[2] Bottling of Yellow Spot had previously ceased in the 1950s, but information in original company journals and ledgers allowed Mitchell & Son to determine the original Yellow Spot was a blend of 12-year-old pot still whiskeys that were matured in a combination of Malaga wine casks (which impart a slightly sweet taste),[2] bourbon barrels, and sherry butts.

[2] When Mitchell & Son initially relaunched Yellow Spot, the plan was to produce limited batches of 500 cases per annum.

[3] This bottling is aged in bourbon barrels and sherry butts much like the other Spot Whiskeys, but with the addition of Marsala wine casks as well for a total of at least 15 years.

[4] Gold Spot was released in commemoration of the 135th year of Spot Whiskey releases by Mitchell & Son in June 2022 using whiskey matured in bourbon barrels, sherry butts, Bordeaux wine casks, and Port pipes, non-chill filtered, aged for 9 years and bottled at 51.4% ABV.