As Luke and his droids enter the cantina, a wall-mounted droid detector warbles, alerting Wuher and the patrons to the unwanted company.
From left to right, "Snaggletooth", or Takeel, a burned-out Snivvian mercenary; "Crocker", or Sai'torr Kal Fas, a Saurin bodyguard; "Plutonian," or Nabrun Leids, the Morseerian smuggler; Wuher, the bartender; "Flash Gorden Midget", or Rycar Ryjerd, the Bimm trader; another "Crocker", Hrchek Kal Fas; and the "Smoker" Dannik Jerriko.
Galaxy Guide 1 got it wrong. The Tonnika sisters are not twins. The Movie Trilogy Sourcebook explains that the girls in the cantina were impostors (elaborated in Tales from the Mos Eisley Cantina by Tim Zahn), since the two look nothing like each other. As an interesting note, Rick Baker and the make-up crew nicknamed the "Space Girls" (their production name) "Star Whores." The sisters were played by Angela Staines and Christine Hewitt.
Solomahol's production name was "Hare Mouse." His mask was also used for an obese humanoid nicknamed "The Colonel" in the cantina. This mask also was used for an alien in Cloud City, in The Empire Strikes Back.
According to production notes, there were at least three "Martians," or Rodians on the cantina set. The Rodians were originally going to have four arms, a feature that was transferred to the "Plutonians" or Morseerians. There were three Plutonians on set as well. This one, Chall Bekan, is somewhat of a town leader in the Mos Eisley alien community.
The alien chatter in this scene is coming from Hrchek, one of the "crockers." The crocker mask, with repainted skin, refinished eyes and without the articulated jaw became the basis for the Trandoshan mask in The Empire Strikes Back.
This shot is reversed (backwards) from the previous. Hrchek and Rycar have switched position.
Duros are humanoids from the Duro system. They have a long history of star travel, and were one of the first cultures to first explore the galaxy. Their production names were "Goggle Eyes". Note the differences in the anatomy of these aliens. Baniss has large, bony hands while Ellors has small, human-sized hands.
The second wolfman in the cantina is the more well-known. Nicknamed "Hyena Man" by the crew, he became Lak Sivrak in expanded fiction. Sivrak is a scout who formerly worked for the Empire, and now works for the Alliance. He will later die in the Battle of Endor.
Dice Ibegon is a florn lamproid, a dangerous species of eel-like predators with the mysterious ability to alter the perception of time. This simple puppet was nicknamed "Snake Head."
In the special edition, Sivrak was replaced with Ketwol, the Patthicip. Ketwol may be an anagram of "low tek" or low tech, since he is a simple puppet in a movie now filled with CG creations. Ketwol was operated by Howie Weed, the puppetteer who would also perform the new wampa. Ketwol uses the same mask as Melas.