After Sindbad sings to Popeye the line "Who's the most remarkable, extraordinary fellow?", the animals respond "You!", and you can then see some of them mouthing "Sindbad the Sailor", but that line is not heard. This happens again on the very next verse.
The sound of the dynamos (illustrating Popeye's spinach-empowered bicep) makes a brief false entrance five seconds before the accompanying visual.