Walt Whitman was the book from her father's library that Michaela wanted Sully to keep hidden from the children in a previous season.
A new door is seen at Dr Mike's clinic that has glass panels and a sheer lace curtain. It has always been a solid wooden door for the past 5 seasons.
At the 22 min mark Sully is seen stacking split firewood next to the house without any covering to keep it from getting wet in the rain.
The song Walt Whitman is heard warbling at the stream is 'Down In the Valley' which was not written until 1925.