In the blasting scene, the fine print in the DANGER sign reads "Sparber Destruction Co". This is a reference to Izzy Sparber an animator at Fleischer Studios who was working on the Superman short 'Destruction Inc.' at the time.
The look of Popeye changes radically in some scenes, due to the fact that old footage from Sock-a-Bye, Baby (1934) was re-used.