The dancers doubling for Betty Compson and Donald Douglas during the acrobatic sequences of "Web of Love" don't match up with them physically. Compson's double is younger and slimmer, while Douglas's double is beefier, especially in the legs.
Overlooking the seeming impossibility of Gabbo having Otto the Dummy speak while Gabbo is eating, smoking, and drinking, Otto's head and mouth move with the words and music when Gabbo is at least six feet away.