1939 was a very solid year for the mostly very enjoyable Popeye series, if not quite the best (1936-1938 were great years for the series) in for me a contender for its best and most consistent period. Not just for Popeye but it was on the most part one of Fleischer Studios', whose Popeye cartoons were of better quality than those for Famous Studios, better periods too, pre-code Betty Boop and the Koko series were good periods similarly.
'It's a Natural Thing to Do' is very nearly one of the best 1939 outings if not one of my favourites of the period. Do agree that it was nice to have something a little different from the usual formula, a little more restrained than usual to match the attempts at sophistication that forms a large part of the story, the premise was a very promising one from the very start and gets better and better as 'It's a Natural Thing to Do' goes on. Sure, there are recognisable elements but there is nothing recycled-feeling here.
The first portion is a bit slow, though the very opening, which is another thing that was different from usual, sets things up for what's to come very promisingly.
Do think too that Pinto Colvig and Margie Hines don't fit Bluto and Olive's character designs and personalities as much as Gus Wickie and Mae Questel, Wickie is far more menacing as the character and it has always felt odd hearing Olive being voiced by somebody else other than Questel.
Once it gets going, which it does very quickly, 'It's a Natural Thing to Do' is enormous fun and keeps delivering on the hilarity and charm. Popeye and Bluto's attempts at sophistication and how badly they fail makes for a plentiful number of gags that are often hilarious. The energy gets wilder leading to a riot of a final third. The whole complaints from fans angle was interesting and like the cartoon was poking fun at any reservations anybody watching the Popeye cartoon had about them.
Popeye and Bluto are both on top form in equal measure and this is among Olive's better appearances. The animation is especially impressive in the backgrounds, previously described as meticulous and that sums them up very well (my way of summing them up too) and the expressions and body language of Popeye. The music is playful and beautifully orchestrated, fitting perfectly with the action. The title song is a highlight. Jack Mercer as always nails it as Popeye, the character's best voice actor by default as nobody else brought to life Popeye's asides and mumblings in the way he did.
In conclusion, very good and nearly great despite a slightly slow start and Hines and Colvig not quite doing it for me. 8/10