By: Addison Wylie There’s a craft to making dirty words and sexual innuendos funny that Sunflower Hour never masters.  Aaron Houston’s mockumentary gathers a decent amount of giggles when its playing up pathetic characters in cleverly clean ways, but the comedy would much rather have those dolts exclaim expletives, or call things “gay”. The film centres around puppeteers competing for an open slot on ‘Sunflower Hour’, a supposedly successful – albeit cheaply made – children’s…