[1] He won the Man-of-the-Match award in the 2011–12 British and Irish Cup Final, helping Munster A to a 31–12 win over Cross Keys.
[4] Butler suffered a broken thumb during Munster's game against Edinburgh in October 2013, ruling him out for 8–10 weeks.
[8] On 30 January 2015, it was announced that Butler would leave Munster at the end of the 2014–15 season, after deciding not to renew his contract.
[10] Butler joined Japanese Top League side Yamaha Júbilo on a two-year contract in January 2020.
[11] Butler moved to Mie Honda Heat, who also play in the Japanese Rugby League One, ahead of the commencement of the 2022 season in January of that year.