The first school for the blind was opened in Colorado Springs in 1874. Dr Mike would have known about it. Reverend Johnson should have been sent there for training instead of Loren's spare room.
The piano duet Michaela played with Theodore was an 'English Country Garden' folksong written for Morris Dancing in 1918.
Surveying is a complex process and the equipment is expensive. It is unclear when and how Sully learned to survey and afford the equipment. It is also unlikely that the railroad company would trust his survey report.
In the previous episode, Brian yearned for more attention from Dr. Quinn. Now Uncle Teddy is offering to give him constant one-on-one attention. Brian should have jumped at the chance.