The original 1973 publication of the poem is available at the Internet Archive and reads as follows:
> while the whitehatted star spangled cowboys
> shot the dark men and shot the dark men
> and we threw popcorn balls and grabbed
> each other and cheered:
> me jewboy yelling
> for the shot town and the falling men
>
> Eli Mandel (1973). _Stony Plain_ , p. 69. Erin, Ontario: press porcépic.
Other reprints of the poem have the same wording, for example, _15 Canadian poets plus 5_ (1978) p. 234; _The Oxford Anthology of Canadian Literature_ (1981), p. 324; _The Spice Box: An Anthology of Jewish Canadian Writing_ (1981), p. 120.
So _The New Oxford Book of Canadian Verse in English_ has a misprint, as you surmised.