'Balls-A-Poppin' was the first flipper machine to feature multiball play. An earlier flipperless electromechanical pinball machine that also featured multiball play was Dudley-Clark Co.'s 1934 'Live Power'. On early production examples of this game, the legs are attached to the side of the cabinet at an angle, as in the flyer. However, somewhere in production between the manufacture of games having the serial numbers B1358 and B1458, the leg design was changed to have them be vertically attached to the corners of the cabinet. Compare this playfield design to the narrow-body Gottlieb's 1956 'Toreador' which came out shortly before this game. The playfield design was used again on Bally's 1957 'Circus'. Manufacturer's list price $485.00 per Cash Box, Dec-29-1956, page 77.