The Japanese spoken at the end means "to be grateful about money is the same as evaporation in Summer".
Archer threatens to go "Josh Randall" on the Yakuza, a nod to the character played by Steve McQueen on the series Wanted: Dead or Alive (1958). Randall famously carried a cut down lever action rifle, or "mare's leg", like the one Archer uses here.
The Hells Angels are a motorcycle gang whose members have been convicted of and are heavily involved in the distribution of methamphetamine.
Title Explained: The title refers to Mr. Moto's motives for the Tunt Manor assault.