Still in line with the escapist attitude of American films at the time. Mr. Deeds follows the humble, American protagonist as he gains money and tosses it aside, “in a Great depression nod” to the humble Americans watching. He falls in love with a beautiful woman and that's his redemption, not the money but true love. This hits the highly demanded “love interest” angle for films of the day. The film attempts to talk about American issues, family issues, moral issues, but ultimately those big ticket discussion items are relegated to the background to make this film work in a market of escapism. So the farcical and love interest elements of Mr. Deeds play far more loudly than the political issues and socio-economic issues that underline the adventure. Capra is a man who feeds sugar coated medicine to the masses and that will come out after the war.
He toys with his audiences by making these grandiose adventure tales where a leading man goes on a moral mission to find himself and the life of virtue but while the adventures touch very near true issues of wealth inequality, social mobility, and inability to get ahead in a rigged system, the movie doesn't fully explore those hard to digest issues.
Overall though this is a relatively good morality tale about the values of hard work and decency and the overall lesson that "money can't buy you love and happiness".