Cliff was simply hanging out on the party Skiff at the Pit of Carkoon when Luke suddenly jumped over and started hacking people up with his Lightsaber. Cliff took a Force-kick in the face, and fell to his death in the Sarlacc.
Jabba's pet Rancor, like all Rancor, had no anus with which to poop. After consuming a meaty Gamorrean, the Rancor felt the usual intense pain with not being able to make stool. Recognizing Luke as a Jedi, the Rancor approached him and asked, in Rancorese, if there was any way he could get assistance with his issue. Luke helped him by closing a giant door on his neck.
Arthur was a pilot for the Empire, and sent out to stop the Rebel starfighters from destroying the Death Star. He was able to shoot down one enemy before being caught in the explosion when Luke blew the space station up.
While working for the Anchorhead Times, he was doing a piece on the disturbing practice of teenagers killing the local Womprats. While in the desert, he was accidentally shot by a teenager killing Womprats.