Apparently, there were two competing films that year and this producer rushed his into a couple of weeks in order to head the other off at the summer fayre pass. Yet it stands up.
“Because production issues had delayed the release of George Pal‘s Destination Moon, Rocketship X-M was quickly shot in just 18 days on a $94,000 budget. It was then rushed into theaters 25 days before the Pal film, while taking full advantage of Destination Moon‘s high-profile national publicity.[3] “